Added documentation.

keyboard/ergodox_ez/keymaps/german-kinergo/readme.md

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+# German Layout for the ErgoDox
+
+This layout is inspired by the "kinesis-qwerty-mod" from benblazak's
+ergodox-firmware, as well as by the "german" layout from the qkm_firmware.
+The goal was to have a layout that is pretty close to an ordinary German
+keyboard, so I don't have to make adjustments on the operating system level
+and I keep some of the muscle memory to use a regular keyboard.
+
+Modifications I made with regard to the aforementioned layouts:
+
+* The key layout is pretty close to the layout of a German Kinesis Ergo Elan.
+  The only exception I made is that I reversed the "up" and "down" cursor keys,
+  since that feels more natural to me.
+
+* All layer changes are "momentary", i.e. they only last as long as the respective key is pressed.
+
+* I sacrificed the Hyper and Meh keys, which I don't use, and put layer change keys in their place.
+
+## Default Layer
+
+![Layout of the default layer](layout.png "Layout of the default layer")
+
+## Code Layer
+
+![Layout of the code layer](layout-code.png "Layout of the code layer")