Update README.md

Author: fffej

README.md

@@ -4,6 +4,8 @@ The goal of this package is to generate arbitrary SQL Server databases (in the f
 
 Contributers more than welcome (especially if you know enough Haskell to help me simplify the code!).
 
+# Usage
+
 # Build instructions
 
 ## Linux
@@ -29,3 +31,12 @@ This'll create a sandbox environment, download and install all the dependencies
 
     x <- sample' (arbitrary :: Gen DatabaseDefinition)
 
+# Usage
+
+Assuming you're already building (if not see the instructions above) then
+
+    cabal run webserver
+    
+Should spin up a web server on port 8888.  Fire up your web browser and try, for example, http://localhost/database/235235235?size=1 to generate a tiny example database.  Play with the size parameter with caution, the whole response is in memory first so big numbers (say > 1000) are probably a bad idea.
+
+Usage should be consistent, so going to the same URL should always generate the same value for testing purposes.