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

qmk.json

@@ -1,4 +1,10 @@
 {
     "userspace_version": "1.0",
-    "build_targets": []
+    "build_targets": [
+		["ploopyco/trackball_nano", "lkbm"],
+		["crkbd/rev1", "t4corun"],
+		["bastardkb/charybdis/3x5/v2/splinky_3", "t4corun"],
+		["planck/rev6", "t4corun"],
+		["bluebell/swoop", "t4corun"]
+	]
 }