Added read me file

readme.txt

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+
+C CGI Xonotic DeFrag
+A CGI script to display data related to Race CTS leaderboards of Xonotic servers.
+
+This program uses an sqlite3 database file created from ~/.xonotic/data/data/server.db.
+It is not responsible for the creation of the database itself.
+
+Environments and Contexts:
+    MinGW/GCC 4.7.1          - compiled
+    SQLite3                  - database functionality
+    Xonotic 0.8.1autobuild   - game and build
+
+Web Server Queries
+    (none)
+        Query file: 
+            queries/mranks.sql
+        Requests the maplist of the server and related data.
+
+    map=<map name>
+        Query file: 
+            queries/mleaderboard-ojoin.sql
+        Requests the leaderboard of the map.
+
+    player=<clientid>
+        Query file: 
+            queries/rplayers.sql
+        Requests a player's ranks for all maps leaderboards s/he is present on.