Create README.md

Author: lucasecf

README.md

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+SQLiteDemo
+===========
+
+## What is this
+
+If you want to lower the persistence level, for any reason, you can easily use the ```C``` based library ```libsqlite3``` in iOS. 
+
+But, if you want to use ```Swift``` instead of ```Objective-C```, you may find some difficulties in importing the library or especially when dealing with the ```C``` pointers and structures inside ```Swift```.
+
+Below, you can see how "beautiful" is the translation of a simple function of this library:
+
+```Swift
+func sqlite3_exec(_: COpaquePointer, 
+                  sql: UnsafePointer<Int8>, 
+                  callback: CFunctionPointer<((UnsafeMutablePointer<Void>, Int32, UnsafeMutablePointer<UnsafeMutablePointer<Int8>>, UnsafeMutablePointer<UnsafeMutablePointer<Int8>>) -> Int32)>, 
+                  _: UnsafeMutablePointer<Void>, 
+                  errmsg: UnsafeMutablePointer<UnsafeMutablePointer<Int8>>) -> Int32
+```
+
+This project is not a wrapper or something like that, it's only a very simple working example on how to effectively use the basic methods of ```libsqlite3```, like how to:
+* Create and remove a database; 
+* Create and remove tables;
+* Insert, Update and Remove elements in a table;
+* Select elements in a table;
+
+
+## Author
+
+Lucas Eduardo, [email protected]