Add changelog

CHANGELOG.md

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+# Chainweaver Changelog
+
+## 2.0 (2020-05-13)
+
+This version features a greatly simplified transfer interface as well as
+numerous other features and smaller improvements.
+
+### UX/UI improvements
+
+* Improved the general ease of use on main work flows
+* More meaningful and accurate in-app guides and descriptions 
+* Automatic generation of an initial key & account on the first launch
+* Streamlined frequently used functionalities such as accounts and coin transfers
+* Add a dedicated receive button with auto generation of TX builder information
+* One-click copying of Tx Builder
+* Easy way to see which accounts you own solely, jointly, or not at all
+
+### Transfer Tool
+
+* A dedicated and convenient tool with support for all of the possible scenarios
+* Supports signing with Chainweaver-generated and externally-generated keys
+* Fully offline signing of transfers using cold wallets
+* Full support for transfers to and from multi-sig accounts
+* Cross chain transfers in all of the above scenarios
+* Pasting a Tx Builder into the account section automatically fills out the owner keyset
+* Detects when your account name is a public key and auto-creates an appropriate keyset
+
+### New Features
+
+* Settings: Change password
+* Settings: Export/Import wallet (also serves as new recovery method)
+* Settings: Export transaction log
+* Ability to Check Tx Status with a Request Key
+