Add README.md

Author: oalders

README.md

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+# Deploy locally
+
+This site is a Hugo site which uses the blowfish theme as a git submodule. Make
+sure you have a recent version of `hugo` installed.
+
+```
+git clone --recurse-submodules --shallow-submodules https://github.com/oalders/tpf-hugo
+cd tpf-hugo
+hugo serve
+```