Migrating over userspace

- existing repo was not forked. Wanted to make sure I was using the standard,
not replicating it
- Updated the readme.md for the latest mappings

users/t4corun/t4corun.c

@@ -0,0 +1,60 @@
+#include "t4corun.h"
+
+layer_state_t layer_state_set_user(layer_state_t  state) {
+
+  state = update_tri_layer_state(state, _NAVIGATION, _NUMBER, _SYMBOL);
+  return state;
+
+}
+
+bool process_record_user(uint16_t keycode, keyrecord_t *record) {
+
+  switch (keycode) {
+
+  case QWERTY:
+    if (record->event.pressed) { set_single_persistent_default_layer(_QWERTY); } //default_layer_set(1UL<<_QWERTY); }
+    return false;
+
+  case CLMAKDH:
+    if (record->event.pressed) { set_single_persistent_default_layer(_COLEMAK_DH); } //default_layer_set(1UL<<_COLEMAK_DH); }
+    return false;
+
+  case GAME:
+    if (record->event.pressed) { set_single_persistent_default_layer(_GAME); } //default_layer_set(1UL<<_COLEMAK_DH); }
+    return false;
+
+  case PN_DRGS:
+    if (record->event.pressed) { 
+      double_tap(KC_NUM, WAIT_DELAY);
+    }
+    return false;
+  
+  case PN_PDPI:
+    if (record->event.pressed) { 
+      double_tap(KC_CAPS, WAIT_DELAY);
+    }
+    return false;
+
+  //https://docs.qmk.fm/#/mod_tap?id=changing-both-tasp-and-hold
+  //https://getreuer.info/posts/keyboards/triggers/index.html#tap-vs.-long-press
+  //https://www.jonashietala.se/series/t-34/ he focuses on a keymap for programming/VIM
+  case TR_LCBR:
+  case TR_LABK:
+  case TR_LBRC:
+  case TR_SQUO:
+  case TR_DQUO:
+  case TR_LPRN:
+  case TR_COMM:
+  case TR_DOT:
+  case TR_PERC:
+  case TR_EQL:
+  case TR_MINS:
+  case TR_GRV:
+  case TR_SCLN:
+  case TR_QUOT:
+    return process_tap_hold_key(record, keycode);
+
+
+  }
+  return true;
+}