Adding the sqlite sourcecode

ext/repair/README.md

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+This folder contains extensions and utility programs intended to analyze
+live database files, detect problems, and possibly fix them.
+
+As SQLite is being used on larger and larger databases, database sizes
+are growing into the terabyte range.  At that size, hardware malfunctions
+and/or cosmic rays will occasionally corrupt a database file.  Detecting 
+problems and fixing errors a terabyte-sized databases can take hours or days,
+and it is undesirable to take applications that depend on the databases 
+off-line for such a long time.
+The utilities in the folder are intended to provide mechanisms for
+detecting and fixing problems in large databases while those databases
+are in active use.
+
+The utilities and extensions in this folder are experimental and under
+active development at the time of this writing (2017-10-12).  If and when
+they stabilize, this README will be updated to reflect that fact.