add release_note.md

Author: oaksharks

docs/source/index.rst

@@ -70,6 +70,7 @@ Example
    Layers<layers.md>
    AutoML<automl.md>
    API<modules.rst>
+   API<release_note.md>
    FAQ<faq.md>
 
 Indices and tables

docs/source/release_note.md

@@ -0,0 +1,22 @@
+Version 0.2.5(stable)
+=====================
+**Main improvements**
+
+1. Support `hypernets>=0.2.5.1`
+2. Support tensorflow builtin Metric class used to evaluate
+
+
+
+Version 0.2.3.1(stable)
+=====================
+**Main improvements**
+
+1. Support `hypernets==0.2.5.1`
+
+
+Version 0.2.3
+=====================
+**Main improvements**
+
+1. Introducing Hypernets `CompeteExperiment`, supports a series of advanced features based on it, please refer to `CompeteExperiment` in hypernets for further information
+