Documentation rewritten.

- Wrote new INSTALL.md with compilation instructions, closes jcelaya#115.
- Added AUTHORS.md with Javier Celaya's info.
- Added CONTRIBUTORS.md with other developers' info.
- Wrote a new README.md

Author: Beep6581

AUTHORS.md

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+# Project initiator:
+Javier Celaya
+<[email protected]>
+https://github.com/jcelaya

CONTRIBUTORS.md

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+# Contributors
+People who made significant contributions, in last name alphabetical order:
+- Pat David https://github.com/patdavid
+- Maciej Dworak https://github.com/Beep6581
+- Andrea Ferrero https://github.com/aferrero2707
+- Alex Forencich https://github.com/alexforencich
+- Jean-Christophe https://github.com/Hombre57
+- Eduardo Pérez https://github.com/eduperez
+- Philip Ries https://github.com/phries
+- Ingo Weyrich https://github.com/heckflosse

INSTALL.md

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+# Compilation
+This document explains how to compile HDRMerge.
+
+## Dependencies
+- [ALGLIB](http://www.alglib.net/)
+- [Boost](http://www.boost.org/)
+- [CMake](https://cmake.org/)
+- [exiv2](http://www.exiv2.org/)
+- [gettext](http://www.gnu.org/software/gettext/)
+- [libexpat](http://expat.sourceforge.net/)
+- [libiconv](https://www.gnu.org/software/libiconv/)
+- [LibRaw](http://www.libraw.org/)
+- [Qt](http://qt-project.org/) 4.8
+- [zlib](http://www.zlib.net/)
+
+Install the dependencies and proceed to the next section.
+
+### Arch and derivatives
+```bash
+sudo pacman -Syy
+sudo pacman -S --needed cmake libraw pacaur qt4
+pacaur -S alglib
+```
+
+### Debian/Ubuntu and derivatives
+```bash
+sudo apt update
+sudo apt install build-essential cmake git libalglib-dev libboost-all-dev libexiv2-dev libexpat-dev libraw-dev qt4-default zlib1g-dev
+```
+
+### Gentoo and derivatives
+```bash
+sudo emerge -uva sci-libs/alglib dev-libs/boost dev-util/cmake media-gfx/exiv2 dev-vcs/git media-libs/libraw sys-devel/gettext dev-libs/expat virtual/libiconv dev-qt/qtcore:4 sys-libs/zlib
+```
+
+## Compilation in Windows
+- Download ALGLIB from http://www.alglib.net/download.php and set the base path in `ALGLIB_ROOT`.
+- Install NSIS from http://nsis.sourceforge.net/Download
+  If you install it to a custom folder, make sure it is accessible from your `PATH` environment variable.
+
+Install all other dependencies.
+
+After the `cmake` process, open `${PROJECT_BINARY_DIR}\setup.nsi` and replace all backslashes with forward slashes in the following:
+- All `MUI_` variables.
+- The lines following `File "hdrmerge.exe"`
+
+Now you can `make install`.
+
+You have finished.
+
+## Compilation in Linux for Linux
+Once you have installed the dependencies, run the following to clone and compile HDRMerge:
+```bash
+mkdir ~/programs
+git clone https://github.com/jcelaya/hdrmerge.git ~/programs/code-hdrmerge
+cd ~/programs/code-hdrmerge
+./build-hdrmerge
+```
+
+HDRMerge will be ready for use in `~/programs/hdrmerge/hdrmerge`
+You have finished.
+
+## Compilation in Linux for Windows
+These instructions are meant to be a guide to cross-compile HDRMerge on Debian for the Windows platform, both 32- and 64-bit editions.
+
+It is assumed that you are installing your cross-compiled libraries in `$HOME/usr/x86_64-w64-mingw32`.
+For the 32-bit version, substitute `x86_64-w64-mingw32` for `i686-w64-mingw32` everywhere it appears.
+
+You will need to build/download the following libraries:
+- Qt
+Unpack Qt and build it as:
+  ```bash
+  ./configure -static -xplatform win32-g++ -device-option CROSS_COMPILE=x86_64-w64-mingw32- -prefix $HOME/usr/x86_64-w64-mingw32/Qt-4.8.6-static -opensource -qt-sql-sqlite -no-qt3support -no-xmlpatterns -no-multimedia -no-phonon -no-webkit -no-javascript-jit -no-script -no-scripttools -no-declarative -qt-zlib -qt-libtiff -qt-libpng -qt-libmng -qt-libjpeg -no-openssl -no-nis -no-cups -no-dbus -qt-freetype -make libs -nomake tools -nomake examples -nomake tests -qtlibinfix 4
+  make install
+  ```
+- LibRaw
+For the libraries that can be built with CMake, you can use the toolchain file that is shipped with HDRMerge. There are two versions, one for 32-bit and another for 64-bit. You probably do not need to change them, but they include some paths that may be different in your system. In particular, you must set the variable `PREFIX` (or pass it as parameter to CMake) to where you want CMake to look for additional software.
+Once LibRaw is uncompressed, it is built with GNU Autoconf:
+  ```bash
+  ./configure --prefix=$HOME/usr/x86_64-w64-mingw32 --host=x86_64-w64-mingw32 --disable-shared --enable-openmp --disable-jpeg --disable-jasper --disable-lcms --disable-examples
+  make install
+  ```
+- zlib
+ZLib is built using a Makefile in the win32 directory:
+  ```bash
+  make -f win32/Makefile.gcc PREFIX=x86_64-w64-mingw32- BINARY_PATH=$HOME/usr/x86_64-w64-mingw32/bin INCLUDE_PATH=$HOME/usr/x86_64-w64-mingw32/include LIBRARY_PATH=$HOME/usr/x86_64-w64-mingw32/lib install
+  ```
+- libiconv
+GNU libiconv is built with GNU Autoconf:
+  ```bash
+  ./configure --prefix=$HOME/usr/x86_64-w64-mingw32 --host=x86_64-w64-mingw32 --disable-shared
+  make install
+  ```
+- libexpat
+libexpat is built with GNU Autoconf:
+  ```bash
+  ./configure --prefix=$HOME/usr/x86_64-w64-mingw32 --host=x86_64-w64-mingw32 --disable-shared
+  make install
+  ```
+- gettext
+  ```bash
+  ./configure --prefix=$HOME/usr/x86_64-w64-mingw32 --host=x86_64-w64-mingw32 --disable-shared
+  make install
+  ```
+- Exiv2
+  ```bash
+  ./configure --prefix=$HOME/usr/x86_64-w64-mingw32 --host=x86_64-w64-mingw32 --disable-shared --with-zlib=$HOME/usr/x86_64-w64-mingw32
+  make install
+  ```
+
+Once you have the dependencies installed, you are ready to compile HDRMerge.
+Set the CMake variable `QT_ROOT` to where you have the Qt libraries installed.
+
+```bash
+mkdir build-win64
+cd build-win64
+cmake -DCMAKE_TOOLCHAIN_FILE=${HDRMERGE_PATH}/cmake/Windows64.cmake -DPREFIX=$HOME/usr/x86_64-w64-mingw32 -DQT_ROOT=$HOME/usr/x86_64-w64-mingw32/Qt-4.8.6-static ${HDRMERGE_PATH}
+make
+```
+
+The result of the compilation should be the binaries `hdrmerge.exe` and `hdrmerge-nogui.exe`.
+You have finished.