separate install instructions

hosters/hetzner-cloud/README.md

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+# Instructions
+
+1. Create a server with any distribution (Ubuntu for exemple) from the Hetzner UI
+2. In your server options on the Hetzner UI click on `Mount image`. Find the NixOS image and mount it
+3. You won't be able to ssh into your server. You will have to do the following steps by logging in with the Hetzner UI.
+  3.a On the top right of the server details click on the icon `>_`.
+  3.b fork this repo and replace your SSH public key in the script. Make a commit on a new branch for example.
+  3.c get the url of the script you created (should look like https://raw.github.com/YOUR_USER_NAME/nixos-install-scripts/YOUR_BRANCH_NAME/hosters/hetzner-cloud/nixos-install-hetzner-cloud.sh)
+  3.d paste the following command into your console gui `curl -L YOUR_URL | sudo bash`
+4. on your own computer you can now ssh into the newly created machine
+
+# Troubleshooting
+
+## SSH `WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!`
+
+if you have sshed into your server before installing NixOS, you will have to remove the server from your .know-hosts file.
+Open the file (located in your .ssh directory) and delete the entry corresponding to the server.
+
+## Curl 404 error
+
+if you copy and paste a url from the Hetzner console GUI, some characters can get replaced (If you are using an English/US keyboard layout for example). Just replace the offending characters (check the punctuation especially, @:_ and the like)