add a changelog to repo

Author: Simon-Laux

Changelog.md

@@ -0,0 +1,29 @@
+# Changelog
+
+
+## 1.4.0 
+Version code **6**
+
+- Add a markdown reader with themes
+- fix zhv.getVersion() api
+
+## 1.3.1
+Version code **5**
+
+- minor change in the manifest
+
+## 1.3.0
+Version code **4**
+
+- enable Localstorage
+
+## 1.2.0
+Version code **3**
+
+- add zhv api in js see readMe for details
+
+
+## First Release (1.1.0)
+Version code **2**
+
+- Basic functionality