- Add a "How to use" entry.

README.md

@@ -1,4 +1,44 @@
 sunny-overlay
 =============
 
-My personal Gentoo Portage overlay.
+Sunny-overlay is my personal Gentoo Portage overlay. Maybe it will be useful for some others (we can always dream).
+
+How to use this overlay ?
+-------------------------
+
+To use this overlay follow those steps
+
+- First you need to install layman
+
+
+    # emerge -av app-portage/layman
+
+- Add sunny-overlay's layman configuration
+
+
+    # cat << EOF > /etc/layman/overlays/sunny-overlay.xml
+    <?xml version="1.0" ?>             
+    <repositories version="1.0">
+	    <repo priority="50" quality="experimental" status="unofficial">
+		    <name>sunny-overlay</name>
+		    <description>My personal Gentoo Portage overlay.</description>
+		    <homepage>https://github.com/dguglielmi/sunny-overlay</homepage>
+		    <owner>
+			    <email>dg@accelance.fr</email>
+		    </owner>
+		    <source type="git">git://github.com/dguglielmi/sunny-overlay.git</source>
+	    </repo>
+    </repositories>
+    EOF
+
+-  Fetch & display a list of all the overlays
+
+
+    # layman -L
+
+-  Finally add sunny-overlay
+
+
+    # layman -a sunny-overlay
+
+