Create methods.avdl

Initial attempt at specifying 2 rpc definitions - read search and readset search.
add namespace
Delete extra newlines
Add missing import line
Remove readsets
Merge remote-tracking branch 'upstream/master' into methods
switch to GA prefix
1 -> 0 based
Merge pull request #26 from cassiedoll/methods

Initial attempt at specifying 2 method definitions - read search and readset search.

Merging based on reaching community consensus.