Add changelog

CHANGELOG.md

@@ -0,0 +1,21 @@
+# Changelog
+
+## Unreleased
+
+  - Patterns without interpolations
+  - Message references
+  - String and Number types external arguments
+  - Mocked Plural Rules
+  - Select expressions
+  - Multi-line patterns
+  - Quoted whitespaces
+  - Travis CI integration
+  - Initial documentation
+  - …
+
+
+## fluent 0.0.1 (January 17, 2017)
+
+  - This is the first release to be listed in the CHANGELOG.
+  - Basic parser support for the FTL syntax
+  - Initial message referencing