Make README useful

Signed-off-by: Ikey Doherty <ikey@solus-project.com>

README.md

@@ -14,6 +14,45 @@ mate-notification-theme-solus is a [Solus project](https://solus-project.com/)
 
 ![screenshot](https://raw.githubusercontent.com/solus-project/mate-notification-theme-solus/master/landing.png)
 
+Building
+--------
+Ensure the following build dependencies are available (`pkg-config` names)
+
+    - gtk+-3.0 >= 3.18.0
+
+To install these on Solus:
+
+```bash
+
+    sudo eopkg it glib2-devel libgtk-3-devel
+    sudo eopkg it -c system.devel
+```
+
+Clone the repository:
+
+```bash
+
+    git clone https://github.com/solus-project/mate-notification-theme-solus.git
+```
+
+Now build it:
+```bash
+
+    cd mate-notification-theme-solus
+    ./autogen.sh --prefix=/usr
+    make -j$(($(getconf _NPROCESSORS_ONLN)+1))
+    sudo make install
+```
+
+Future
+------
+
+We'd like to see `mate-notification-daemon` enhanced, so we'll work with upstream
+to add new features. Specifically, this theme has built-in handling for `action-icons`
+functionality, but we need to send a pull request upstream to enable all of the
+existing themes to support this, and to broadcast the functionality in the `d-bus`
+service.
+
 License
 -------