[git] Document server configuration.

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+git
+===
+
+Create a new user.
+
+```
+$ apt install git
+$ adduser git # <password> <password>
+```
+
+Allow connection only with SSH keys.
+
+```
+$ chmod 400 ${SSH_DIR}/id_rsa*
+$ ssh-copy-id -i ${SSH_DIR}/id_rsa git@<server-ip>
+```
+
+Login with SSH key.
+
+```
+$ ssh -i ${SSH_DIR}/id_rsa git@<server>
+```
+
+Disable login with password.
+
+```
+$ passwd --lock git
+```
+
+Create new bare repository.