Add initial change log

CHANGELOG.md

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+# Changelog
+
+## v0.3.0
+
+  * Features:
+    - Search for accounts or content
+    - Get an account's relationship
+    - Fetch user's blocks
+    - Fetch a list of follow requests
+    - Fetch user's mutes
+    - Get instance information
+    - Fetch user's notifications
+    - Getting a single notification
+    - Clear notifications
+    - Fetch user's reports
+    - Report a user
+    - Get status context
+    - Get a card associated with a status
+
+## v0.2.0
+
+  * Features:
+    - Add media files
+    - Fetching user's favorites
+    - (un)favoriting a status
+
+ ## v0.1.0
+
+  * Initial release