Feat/port ft mars 65 (#17994)

* by wonderbeel

keyboards/ft/mars65/readme.md

@@ -0,0 +1,21 @@
+# Mars 6.5
+
+65% Keyboard with in switch backlight and RGB Underglow. 
+
+![Mars 6.5 image](https://i.imgur.com/cg5qADrh.jpg)
+
+* Keyboard Maintainer: [wonderbeel](https://github.com/wonderbeel)
+* Hardware Supported: Mars 6.5 PCB
+* Hardware Availability: [Group Buy now completed](https://geekhack.org/index.php?topic=98601.0)
+
+Make example for this keyboard (after setting up your build environment):
+
+    make ft/mars65:default
+
+Flashing example for this keyboard ([after setting up the bootloadHID flashing environment](https://docs.qmk.fm/#/flashing_bootloadhid))
+
+    make ft/mars65:default:flash
+
+**Reset Key:** Hold down the key located at `K00`, commonly programmed as `Pause/Break` while plugging in the keyboard.
+
+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 our [Complete Newbs Guide](https://docs.qmk.fm/#/newbs).