(ssh/scp) added file on topic

ssh_scp.md

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+# `ssh` & `scp`
+
+This document holds various notes on `ssh` & `scp`.
+
+<!--toc:start-->
+- [`ssh` & `scp`](#ssh-scp)
+  - [connect to client](#connect-to-client)
+  - [generate ssh key](#generate-ssh-key)
+<!--toc:end-->
+
+
+## connect to client
+
+In order to connect to a client use the `ssh` command with user and address as arguments.
+Here some examples:
+
+```sh
+# connect as user on remote device
+ssh <user>@<ip>
+ssh pi@155.1.1.120
+
+# connect as user via url
+ssh <user>@<url>
+ssh user@github.com
+```
+
+
+## generate ssh key
+
+To generate a ssh keypair use `ssh-keygen`:
+
+```sh
+ssh-keygen -t ed25519
+# or
+ssh-keygen -t ed25519 -C "email@address.domain"
+```
+
+Place the generated keypair in `$HOME/.ssh` (on linux systems).
+The `*.pub` file is the public key and the one to upload to `github` and Co.
+
+> **Important:** double check that you never upload the private key!!
+
+
+# TODO: add section `scp`