Add instructions

README.md

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+# How to contribute
+
+1. Generate an SSH key pair via `ssh-keygen` in your terminal (make sure not to overwrite an existing key!).
+
+2. Add the configuration in `.ssh/config` to your local SSH configuration file.
+
+3. Point the `IdentityFile` parameter to your local key file location (in most cases `~/.ssh/id_ed25519` or equivalent with RSA).
+
+4. Go into your Gitea Settings, then SSH/GPG Keys section, then upload your public key (in most cases, a file called `id_ed25519.pub`).
+
+5. You can now contribute code!