Add information to README.md

Makefile

@@ -14,7 +14,6 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-CC=gcc
 DEBUG=0
 INCFLAGS=
 LDFLAGS=-lsqlite3

README.md

@@ -1,7 +1,24 @@
 # Menu Helper
 
+A program to manage a database of recipes and help you to pick out meals based
+on filters of ingredients and tags.
+
 ## Usage
 
+Ensure the `XDG_DATA_HOME` variable is set (e.g. to `$HOME/.local/share`).
+
 ## Building
 
+To build the program you will require the following dependencies:
+
+- A C compiler compatible with GNU99 C (preferably GCC).
+- SQLite3 C library
+- Make
+
+Once installed, compile the project with the `make` command.
+
 ## License
+
+This program is licensed under the terms & conditions of the GNU General Public
+License version 3 or greater. See the [LICENSE](/LICENSE) file for more
+information.