[Keyboard] Add minimon/Index tab 13x6 ortho (#14765)

Co-authored-by: Joel Challis <git@zvecr.com>
Co-authored-by: Drashna Jaelre <drashna@live.com>
Co-authored-by: Ryan <fauxpark@gmail.com>

keyboards/minimon/index_tab/readme.md

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+# Index Tab
+
+Not just another ortho-keyboard. but one catering to the northern marked with our extra letters.
+This is a 13x6 ortho keyboard; giving you enough space for all the numbers, all the F-keys, and our precious extraordinary letters.
+
+![Picture of the keyboard in the wild](https://raw.githubusercontent.com/Kyrremann/index-tab/master/images/rev5-dsa-vilebloom.JPG)
+
+Keyboard Maintainer: [Kyrremann](https://github.com/Kyrremann)
+
+The keyboard files can be found here: https://github.com/Kyrremann/index-tab
+
+
+## Instructions
+
+To create a hex file for the Index Tab, run:
+
+    make minimon/index_tab:default
+
+Flash the keyboard with QMK Toolbox or run:
+
+    make minimon/index_tab:default:flash
+    
+How to enter bootloader (DFU):
+
+Press the reset button on the underside of the board, near the USB port.
+
+See the [build environment setup](https://docs.qmk.fm/#/getting_started_build_tools) and the [make instructions](https://docs.qmk.fm/#/getting_started_make_guide) for more information.
+Brand new to QMK? Start with the [Complete Newbs Guide](https://docs.qmk.fm/#/newbs).
+
+
+## Default layout
+
+![Index Tab layout image](https://raw.githubusercontent.com/Kyrremann/index-tab/master/images/index-tab.png)
+
+[Keyboard layout editor](http://www.keyboard-layout-editor.com/#/gists/2577189f7cf19d980fff8177d14dc3ec)