[Keymap] add noroadsleft userspace; add and update keymaps (#11686)

users/noroadsleft/readme.md

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+# @noroadsleft's Userspace
+
+This directory holds the code that's the same for every keyboard I use in QMK, which is currently:
+
+| Status             | Keyboard |
+| :----------------- | :------- |
+| :heavy_check_mark: | `kc60`
+| :heavy_check_mark: | `kbdfans/kbd75/rev1`
+
+## Features
+
+### Emulated Non-US Backslash
+
+Sends `KC_NUBS` when the Z key is tapped while the Right Alt key is being held.
+
+### Emulated Numeric Keypad
+
+Turns number row keycodes into their numeric keypad equivalents while the Right Alt key is being held.
+
+### Emulated F13-F24
+
+Turns F1-F12 into F13-F24 while the Right Alt key is being held.
+
+
+## License
+
+Copyright 2020 noroadsleft
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.