Create README.md

Author: DoogeJ

README.md

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+# MonoGame.Primitives2D
+The 2D XNA Primitives project ported to the modern world
+
+This is a modernized version of https://bitbucket.org/C3/2d-xna-primitives/wiki/Home
+
+Differences with the original repository (last updated 2012):
+ * Updated the project files to Visual Studio 2017
+ * Updated to .NET Framework 4.5
+ * Updated to MonoGame 3.6 instead of using XNA
+ * Renamed namespaces
+ * New sample project based on the original
+ * Removed old broken sample projects
+ 
+ ## License
+ This work is licensed under the zlib license, which is pretty close to saying: do what you want.