[Keymap] Added Layout Keymaps for BriianPowell (#17310)

* Keymaps for Gentleman65 and Discipline

* Apply suggestions from code review

* Update keyboards/coseyfannitutti/discipline/keymaps/briianpowell/keymap.c

* More custom configuration for Gentleman65

* Completed Gentleman65 Layout (for now)

keyboards/coseyfannitutti/discipline/keymaps/briianpowell/readme.md

@@ -0,0 +1,15 @@
+# Discipline Keyboard Compilation
+
+## Features
+
+- Base Layers
+    - QWERTY
+    - Workman
+- Mouse Keys
+- Entertainment Keys
+
+## Building and flashing
+
+```
+make coseyfannitutti/discipline:briianpowell:flash
+```