[Addition] - README

Author: TacoConKvass

README.md

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+# RL2.ModLoader.DevSetup
+A simple cross platform program to ease starting the development process of RL2.ModLoader for new contributros.
+Upon running the program:
+- The user is prompted to point to the installation directory of Rogue Legacy 2.
+  - It's the one with the games executable.
+- The necessary library files are copied to a `../lib/` directory.
+
+### Use of this program is not necessary, it's just a utility. 
+If one wishes to perform a manual setup:
+- Open the games installation directory.
+- Open the `Rogue Legacy 2_Data/Managed` directory.
+- Copy all files except of `RL2.ModLoader.dll` if present.