Add some light source overview documenation

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+# DAW Source documenation
+
+The source code is "organized" (ha ha) into modules, where a light effort has
+been made to make each as contained as time has allowed.
+
+It is planned to put module-API documentation, and technical details in each
+sub-module under a `docs` folder, when time comes around to a consistent and
+stable API.
+
+# core
+
+Core loop and initialization module, couples it all together in the messiest way
+possible.
+
+
+# ctrl
+
+Input handling module. Arguably this could be a submodule of the "rendering"
+module as the ctrl module is heavily dependent on it.
+
+
+# rendering
+
+Rendering backend and window handling support. Currently The only platform
+library supported is GLFW with OpenGL support (using GLAD), but it would be neat
+to add SDL support back in at some point, once everything is nicely decoupled.
+
+
+# resources
+
+Resource loading and manipulation.
+
+
+# utils
+
+General utilities like common data structures and neat algorithms to make game
+development a little easier.