feat: Add README

README.md

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+KiCAD Templates
+---------------
+Common set of KiCAD templates for JLCPCB. Copied and adapted from [https://github.com/squantor/templates_kicad].
+
+## Checkout Notes
+This repository includes submodules for standard component libraries, so after checking out do not forget to also check out submodules.
+
+```shell
+git clone https://git.asymworks.com/asymworks/kicad_templates
+git submodule init
+git submodule update
+```
+