docs(tutorials/install): add From Go package (backport cometbft#2414)…

… (cometbft#2437)

This is an automatic backport of pull request cometbft#2414 done by
[Mergify](https://mergify.com).


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Co-authored-by: DragonKid <[email protected]>

docs/guides/install.md

@@ -4,6 +4,20 @@ order: 3
 
 # Install CometBFT
 
+## From Go Package
+
+Install the latest version of CometBFT's Go package:
+
+```sh
+go install github.com/cometbft/cometbft/cmd/cometbft@latest
+```
+
+Install a specific version of CometBFT's Go package:
+
+```sh
+go install github.com/cometbft/cometbft/cmd/[email protected]
+```
+
 ## From Binary
 
 To download pre-built binaries, see the [releases page](https://github.com/cometbft/cometbft/releases).