doc: Add historical release notes

Add all known release notes for versions since 0.3.12,
thanks to Matt Corallo for collecting them on the wiki.

doc/release-notes/release-notes-0.3.20.md

@@ -0,0 +1,22 @@
+Please checkout the git integration branch from:
+
+https://github.com/bitcoin/bitcoin
+
+... and help test.  The new features that need testing are:
+
+* -nolisten : https://github.com/bitcoin/bitcoin/pull/11
+* -rescan : scan block chain for missing wallet transactions
+* -printtoconsole : https://github.com/bitcoin/bitcoin/pull/37
+* RPC gettransaction details : https://github.com/bitcoin/bitcoin/pull/24
+* listtransactions new features : https://github.com/bitcoin/bitcoin/pull/10
+
+Bug fixes that also need testing:
+
+* -maxconnections= : https://github.com/bitcoin/bitcoin/pull/42
+* RPC listaccounts minconf : https://github.com/bitcoin/bitcoin/pull/27
+* RPC move, add time to output : https://github.com/bitcoin/bitcoin/pull/21
+* ...and several improvements to --help output.
+
+This needs more testing on Windows!  Please drop me a quick private message, email, or IRC message if you are able to do some testing.  If you find bugs, please open an issue at:
+
+https://github.com/bitcoin/bitcoin/issues