Merge pull request #133 from rkm3/rkm3/adds-screen

basic usage for screen

common/screen.md

@@ -0,0 +1,20 @@
+# screen
+
+> Hold a session open on a remote server. Manage multiple windows with a single SSH connection.
+
+-  Start a new screen session
+
+`screen`
+
+- Show open screen sessions
+
+`screen -ls`
+
+- Reattach to an open screen
+
+`screen -r {{screen id}}`
+
+- Detach from inside a screen
+
+`ctrl+A D`
+