Add go install README

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+
+Grab latest binary from https://go.dev/dl/
+
+Optional: Backup previous install:
+
+```sh
+# Backup previous install
+mv $HOME/.go $HOME/Downloads/golang.bak
+# Install from `.tar.gz`:
+tar xf $HOME/Downloads/go*.tar.gz --directory $HOME;mv $HOME/go $HOME/.go
+```
+
+Verify your `go` version with:
+
+```sh
+which go
+go version
+```