Update the docs

README.md

@@ -17,25 +17,37 @@ You'll also need the following commands in your path to generate the gresource b
 
 After installing all the dependencies, switch to the cloned directory and, run the following in Terminal,
 
-```
+```sh
 make
 sudo make install
 ```
 
 To set the theme in Gnome, run the following commands in Terminal,
 
-```
+```sh
 gsettings set org.gnome.desktop.interface gtk-theme "Numix"
 gsettings set org.gnome.desktop.wm.preferences theme "Numix"
 ```
 
 To set the theme in Xfce, run the following commands in Terminal,
 
-```
+```sh
 xfconf-query -c xsettings -p /Net/ThemeName -s "Numix"
 xfconf-query -c xfwm4 -p /general/theme -s "Numix"
 ```
 
+### For developers
+
+If you want to hack on the theme, make sure you have the `inotifywait` command available, which is used for watching and automatically building the files.
+
+To start watching for changes, run the following,
+
+```sh
+make watch
+```
+
+If you change any assets, you'll need to regenerate the `gtk.gresource.xml` and `gtk.gresource` files. You can use [grrr](https://github.com/satya164/grrr) to do it easily.
+
 ### Requirements
 
 GTK+ 3.16 or above