Add README and GitHub workflow

README.md

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+# Raft
+
+A Raft implementation in F#.
+
+# Development tips
+
+There are pull request checks on this repo, enforcing [Fantomas](https://github.com/fsprojects/fantomas/)-compliant formatting.
+After checking out the repo, you may wish to add a pre-push hook to ensure locally that formatting is complete, rather than having to wait for the CI checks to tell you that you haven't formatted your code.
+Consider performing the following command to set this up in the repo:
+```bash
+git config core.hooksPath hooks/
+```
+Before your first push (but only once), you will need to install the [.NET local tools](https://docs.microsoft.com/en-us/dotnet/core/tools/local-tools-how-to-use) which form part of the pre-push hook:
+```bash
+dotnet tool restore
+```
+