[Keyboard] Lagrange handwired keyboard (#11374)

* [Keyboard] Add the Lagrange keyboard

* Covert the master side to use the SPI driver.

1 files changed, 21 insertions, 0 deletions

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+# Lagrange
+
+An ergonomic, split, concave keyboard, with convex thumb pads.  See the [project page](https://github.com/dpapavas/lagrange-keyboard) for more info.
+
+![Lagrange](https://github.com/dpapavas/lagrange-keyboard/blob/master/doc/lagrange_keyboard.png?raw=true)
+
+* Keyboard Maintainer: [Dimitris Papavasiliou](https://github.com/dpapavas)
+* Hardware Supported: Lagrange PCB Rev A
+* Hardware Availability: See the build guide on the [project page](https://github.com/dpapavas/lagrange-keyboard).
+
+Make example for this keyboard (after setting up your build environment):
+
+    make handwired/lagrange:default
+
+Flashing example for this keyboard:
+
+    make handwired/lagrange:default:flash
+
+To program the keyboard you'll need to reset it.  This can be accomplished, either through the reset button, accessible via a hole in the bottom cover, or, if you've assigned the `RESET` keycode to a key, by pressing that key.
+
+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).