docs: add license

LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2024 s3lph
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

@@ -36,7 +36,7 @@ form a single WS2812 chain.  There are 83 LEDs in the current version, so a tota
 The ESP32-C3 needs to be soldered to the first PCB.
 
 > :warning: **There is a small issue with V1.0 of the PCB!** (Please check the version number on the silk screen!):
-> 
+>
 > Pins 1 and 4 of the OUT pin header are swapped - this can be easily worked around by swapping wires number 1 and 4 in the JST connector plugged into this header.
 
 ### esp32/
@@ -54,6 +54,12 @@ The PlatformIO Arduino project for the ESP32.  It perfoms the following tasks:
 The list of SpaceAPI endpoints to display is defined in `esp32/src/spacemap.h`.
 The position of an endpoint in the `spaces` array corresponds to the index of the WS2812 LED it controls.
 
+To compile and upload the code to the ESP32, use PlatformIO:
+
+```shell-session
+pio run -t upload
+```
+
 ### led_plugging_tool/
 
 A 3D-printable tool that helps with cutting the LED legs to size and attach them to JST ZH-4 connectors the correct way.
@@ -77,7 +83,20 @@ Usage:
 - ESP32-C3 Super Mini: https://de.aliexpress.com/item/1005006252882434.html
 - JST-ZH cables: https://de.aliexpress.com/item/1005007298855435.html (4P, Reversed)
 
+## License
+
+Unless otherwise noted, the contents of this repository are licensed under the MIT License (See LICENSE).
+
+### Public Domain Data
+
+I consider the contents of `erfamap-output/` and `esp32/src/spacemap.h` to be in the public domain.
+
+If they are not, I license these under the Creative Commons [CC0 1.0][cc0] "No Rights Reserved" license.
+
+
+
 
 [spaceapi]: https://spaceapi.io
 [erfamap]: https://git.kabelsalat.ch/s3lph/erfamap
 [api.spaceapi.io]: https://api.spaceapi.io/
+[cc0]: https://creativecommons.org/publicdomain/zero/1.0/

esp32/src/spacemap.h

@@ -1,4 +1,10 @@
 
+/*
+ * CC0: This work (spacemap.h) has been marked as dedicated to the public domain.
+ * https://creativecommons.org/public-domain/cc0/
+ */
+
+
 const char* spaces[] = {
   // 0
   "https://www.posttenebraslab.ch/status/status.json",