elaborate on licensing and contributions

README.md

@@ -25,11 +25,16 @@ the manufacturing files and overview page:
 * For every board, the KiCAD project should be given a unique name, and have the same name as the containing folder. 
   Example: `epdiy-v7/epdiy-v7.{kicad_pro,kicad_pcb,kicad_sch}`. 
   An existing KiCAD project can be renamed by selecting `File -> Save As` in the main KiCAD window and saving it to a folder with the new name.
+* Unless you *explicitly* specify otherwise, your contribution will be licensed under the Creative Commons Attribution-ShareAlike 4.0 International License.
+  Feel free to mention in the README in your project folder how you want to be attributed.
+  Please indicate in the PR if you intend to use a different license.
 * Each board needs a README.md in it's project folder, which will also appear as description in the presentation page.
   Refer to `epdiy-v7/README.md` for an example.
 * If it's a helper or an adapter board, place it in the appropriate `helpers` or `adapters` folder.
 * Delete the manufacturing files and keep only the sources.
   Since we generate those automatically, having potentially outdated ones in the repo will be confusing. 
+* Add your board to the `BOARDS` list in the root `Makefile`.
+  This enables the continuous integration to build the manufacturing files for your board.
 
 ## Available Hardware
 
@@ -42,4 +47,7 @@ For each board, we provide:
 - PDF Schematic
 - 3D model of the board for use in CAD
 
+## Licensing
+
+Unless otherwise specified, the hardware sources provided are licensed under the terms of the Creative Commons Attribution-ShareAlike 4.0 International License.
 <a rel="license" href="https://creativecommons.org/licenses/by-sa/4.0/">Creative Commons Attribution-ShareAlike 4.0 International License <img alt="Creative Commons License" style="border-width:0" src="https://i.creativecommons.org/l/by-sa/4.0/80x15.png" /></a>