Creates a userspace for keymaps (#1559)

* create a user space

* adds example

* document, add readme.md

* jackhumbert userspace, ergodox keymap

users/_example/_example.h

@@ -0,0 +1,8 @@
+#ifndef USERSPACE
+#define USERSPACE
+
+#include "quantum.h"
+
+void my_custom_function(void);
+
+#endif