doc: Add readme documentation

README.md

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+# Cosplay
+
+This is the design repository for NorCal Hakkero Factory No. 1.
+
+## Development
+
+Most cosplay schematics are created with Blender, CadQuery, and Inkscape. To
+enter into a CadQuery environment, install `poetry` and use
+```sh
+poetry install
+poetry shell
+```
+and this should succeed
+```sh
+python3 -c "import nhf"
+```
+