Build-environment-setup.md

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+Assuming Ubuntu 20.04.
+
+The truly important things -- git with lfs support:
+
+```shell
+sudo apt install git
+curl -s https://packagecloud.io/install/repositories/github/git-lfs/script.deb.sh | sudo bash
+sudo apt install git-lfs
+git lfs install
+```
+
+Miscellaneous things needed for various command-line tools to work:
+
+```shell
+sudo apt install pngcrush  # pre-commit hook
+sudo apt install dos2unix  # because microsoft sprays \r everywhere
+```