ssh-add: add page (now for real)

pages/common/ssh-add.md

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+# ssh-add
+
+> Manage loaded RSA or DSA keys in the ssh-agent.
+
+- Add a new key to the ssh-agent:
+
+`ssh-add {{path/to/private_key}}`
+
+- List fingerprints of currently loaded keys:
+
+`ssh-add -l`
+
+- Delete a key from the ssh-agent:
+
+`ssh-add -d {{path/to/private_key}}`
+
+- Delete all currently loaded keys from the ssh-agent:
+
+`ssh-add -D`
+
+- For MacOS: Add a key to the ssh-agent and the keychain:
+
+`ssh-add -K {{path/to/private_key}}`