Merge pull request #223 from jtpereyda/ubuntu-install

add ubuntu install instructions

README.md

@@ -1,8 +1,8 @@
 i3lock - improved screen locker
 ===============================
-i3lock is a simple screen locker like slock. After starting it, you will
-see a white screen (you can configure the color/an image). You can return
-to your screen by entering your password.
+[i3lock](https://i3wm.org/i3lock/)> is a simple screen locker like slock.
+After starting it, you will see a white screen (you can configure the
+color/an image). You can return to your screen by entering your password.
 
 Many little improvements have been made to i3lock over time:
 
@@ -18,6 +18,11 @@ Many little improvements have been made to i3lock over time:
 - i3lock uses PAM and therefore is compatible with LDAP etc.
   On OpenBSD i3lock uses the bsd_auth(3) framework.
 
+Install
+-------
+
+See [the i3lock home page](https://i3wm.org/i3lock/).
+
 Requirements
 ------------
 - pkg-config