Adding REAMDEs to directories

src/Module/README.md

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+## Friendica\Module
+
+The Module namespace contains the different modules of Friendica.
+Each module is loaded through the [`App`](https://github.com/friendica/friendica/blob/develop/src/App.php).
+
+Rules for Modules:
+- 	Named like the call (i.e. https://friendica.test/contact => `Contact`)
+-	Start with capitals and are **not** camelCased.
+-	Directly interacting with a given request (POST or GET)
+-	Extending [`BaseModule`](https://github.com/friendica/friendica/blob/develop/src/BaseModule.php).