docs: Add release notes for v0.7.0

docs/release-notes/release-notes-0.7.0.md

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+# dcrlnd v0.7.0
+
+This release is the first release for the v2.0 line of Decred tool releases.
+
+While dcrlnd itself has few changes, it brings in all changes inherited from
+the [corresponding dcrwallet 
+release](https://github.com/decred/dcrwallet/releases/tag/release-v2.0.0).
+
+The following is the list of dcrlnd-specific changes for v0.7.0.
+
+- Additional logging for [pathfinding](https://github.com/decred/dcrlnd/pull/212) 
+  and [topology changes](https://github.com/decred/dcrlnd/pull/209) to help
+  debug payment failures.
+
+- Fixed issue with [future timestamps](https://github.com/decred/dcrlnd/pull/211) 
+  causing the gossiper to fail to fetch updates upon reconnecting to a peer.
+
+- [Improved the performance](https://github.com/decred/dcrlnd/pull/208) of the
+  Mission Control Store, in particular for clients that make only occasional
+  payments or otherwise sit idle for long periods of time.
+
+- [Exposed the 
+  `disablerelaytx`](https://github.com/decred/dcrlnd/pull/213/commits/36a71209b25c5fa67ab1160561a31e30bf75145f)
+  config argument that was recently introduced by dcrwallet to disable receiving
+  mempool transactions from peers.
+
+- [Passing the aezeed
+  birthday](https://github.com/decred/dcrlnd/pull/213/commits/53c91821abbe4d9a93c61b23a853960275e29a6d)
+  to dcrwallet when creating or restoring a dcrlnd instance, making both
+  operations significantly faster, in particular creation of wallets from new
+  seeds, which remove the need for long-running and cpu-intensive account and
+  address discovery stages.
+
+
+
+# Contributors (Alphabetical Order)
+
+  - David Hill
+  - Matheus Degiovani
+