Add release notes for 1.8.3

RELEASE_NOTES_1.8.3.md

@@ -0,0 +1,24 @@
+# Dogecoin Core 1.8.3
+
+Dogecoin Core 1.8.3 is a security release. It fixes issues in regards to an upcoming announcement of possible DoS vulnerabilities.
+See [the announcement on the bitcoin-dev mailing list](https://lists.linuxfoundation.org/pipermail/bitcoin-dev/2015-June/009135.html) for reference.
+It is strongly recommended to upgrade your installation in case you run a node open to inbound connections from the internet.  
+If your installation is not open to incoming connections this update is not mandatory, but we still recommend keeping your client up to date.
+
+## Dogecoin Core Release Notes
+
+* Pull in patches from usptream to mitigate the risk of a DoS attack.
+* Update the DNS seeds for more reliable bootstrapping of the initial peer discovery.
+* Update the list of fixed nodes, in case all other means of peer discovery fail.
+
+## Credits
+
+Listed in strictly alphabetical order, using name listed in Github. This
+includes those whose contributions to Bitcoin Core have been merged
+into this Dogecoin Core release:
+
+* P. Kaufmann
+* Max K.
+* Ross Nicoll
+* Wladimir J. van der Laan
+* Pieter Wuille