Add README.md

Author: juzzlin

README.md

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+SimpleLogger
+============
+
+Looking for a simple logger for C++ ? SimpleLogger might be for you.
+
+# Features
+
+* Based on RAII
+* Configurable level symbols
+* Date / time
+* Logging levels: Trace, Debug, Info, Warning, Error, Fatal
+* Log to file and/or console
+* Very easy to use
+
+# Installation
+
+Just add `src/logger.hpp` and `src/logger.cpp` to your project and start using it!
+
+# Examples
+
+## Log to console
+
+```
+using juzzlin::L;
+
+L().info() << "Something happened";
+```
+
+Outputs something like this:
+
+`[Sat Oct 13 22:38:42 2018] I: Something happened`
+
+## Log to file and console
+
+```
+using juzzlin::L;
+
+L::init("/tmp/myLog.txt");
+
+L().info() << "Something happened";
+```
+
+## Log only to file
+
+```
+using juzzlin::L;
+
+L::init("/tmp/myLog.txt");
+L::enableEchoMode(false);
+
+L().info() << "Something happened";
+```
+
+## Set logging level 
+
+```
+using juzzlin::L;
+
+L::setLoggingLevel(L::Level::Debug);
+
+L().info() << "Something happened";
+L().debug() << "A debug thing happened";
+```
+
+Outputs something like this:
+
+`[Sat Oct 13 22:38:42 2018] I: Something happened`
+
+`[Sat Oct 13 22:38:42 2018] D: A debug thing happened`
+
+## Set custom level symbols
+
+```
+using juzzlin::L;
+
+L::setLoggingLevel(L::Level::Debug);
+L::setLevelSymbol(L::Level::Debug, "<DEBUG>");
+
+L().debug() << "A debug thing happened";
+```
+
+Outputs something like this:
+
+`[Sat Oct 13 22:38:42 2018] <DEBUG> A debug thing happened`
+
+## Requirements
+
+C++11
+
+## Licence
+
+MIT