It's very easy to add your business to Google.
Go to Google Places.
If you already have Google account then sign in other wise register here.
On Google places homepage, click on Add new business.
Then, on Find your business tab search for your business.
Search the details if you don;t find your business then click Add new listing.
Fill out the details here and click submit.
Choose how would you like to verify your listing and click finish.
You can see your listing by signing in to Google places and then click on see my listing.