[Keymap] add kinesis/keymaps/stapelberg (#12430)

keyboards/kinesis/keymaps/stapelberg/readme.md

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+# Michael Stapelberg’s keymap for the Kinesis Advantage
+
+I adjust the thumb block mapping slightly to have a standard set of modifiers
+(Control, Alt, GUI/Windows, Right Alt) and Escape available conveniently.
+
+Specifically, my keymap makes the following changes:
+
+* Left thumb block:
+  * Swap `Delete` with `Escape` (top left), from my Vim days :)
+  * The `Home` key on the left thumb block is replaced by `Left GUI/Windows`.
+* Right thumb block:
+  * The top left key on the right thumb block produces `Right Alt`.
+
+## Corresponding Kinesis configuration
+
+My keymap corresponds to the following Kinesis configuration tool settings:
+
+```
+[escape]>[delete]
+[rwin]>[ralt]
+[delete]>[escape]
+[home]>[lwin]
+[intl-\]>[kp-insert]
+```
+
+Note: the last line makes the international key (labeled `|`, `\` and `Insert`)
+produce `Insert`, which is default with QMK, but not default Kinesis.