Merge pull request #51 from NicoWde/master

Enhancing 'Hetzner example' docs

examples/hcloud-k3s/README.md

@@ -2,9 +2,27 @@
 
 Configuration in this directory creates a k3s cluster resources including network, subnet and instances.
 
+## Preparations
+
+Make sure your [SSH-Agent](https://docs.github.com/en/github/authenticating-to-github/generating-a-new-ssh-key-and-adding-it-to-the-ssh-agent#adding-your-ssh-key-to-the-ssh-agent) is running (it is neccessary for Terraform), and if not, start it and add your ssh-key:
+
+```bash
+# example, with active ssh-agent
+$ ssh-add -L
+> ssh-rsa AAAAB4NzaC4Xc2FA2A...Me3IABDICy+WANsg5Mc= /home/user/.ssh/id_rsa
+> ssh-rsa AAAAB4NzaC4Xc2FA2A...VpJaZ5EawNpQaPvqEw== /home/user/.ssh/another_user_key
+# if nothing is loaded
+# start the ssh-agent in the background
+$ eval `ssh-agent -s`
+> Agent pid 59566
+# add your SSH private key to the ssh-agent
+$ ssh-add ~./ssh/path-to-sshkey
+> Identity added: ~./ssh/path-to-sshkey (~./ssh/path-to-sshkey)
+```
+
 ## Usage
 
-To run this example you need to execute:
+After checking/enabling ssh-agent, to run this example you need to execute:
 
 ```bash
 $ terraform init