EPICS db builder: Add top level README

git-svn-id: svn+ssh://serv0002.cs.diamond.ac.uk/home/subversion/repos/controls/diamond/trunk/python/epicsdbbuilder@128386 e099a375-04f9-0310-9d5f-a741eaff62e1

README.rst

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+EPICS Database Builder
+======================
+
+This Python module is designed to make it easy to build complex EPICS databases
+by writing a Python script.  While writing record templates the corresponding
+dbd entries are checked to reduce the number of errors in the database.
+
+A simple example of the use of this library is the following::
+
+    from epicsdbbuilder import *
+    InitialiseDbd('/dls_sw/epics/R3.14.12.3/base/')
+    SetTemplateRecordNames()
+
+    a = records.ao('TEST')
+    c = records.calc('CALC', CALC = 'A+B', SCAN = '1 second', INPA = a.VAL)
+    c.INPB = c
+
+    WriteRecords('output.db')
+
+See the ``docs`` directory for more detailed documentation.