feat: update readme for release & add changelog file (#94)

* fix: update readme

* fix: add changelog file

Co-authored-by: shaimoria <shai.moria@zooz.com>

Author: shyimo

CHANGELOG.md

@@ -0,0 +1,10 @@
+## 1.0.0 (March 1, 2021)
+
+  * Initial release
+
+FEATURES:
+
+* **HA Setup**: multiple nodes, each with multiple replicas
+* **AZ/Rack aware**: HA node distribution able to use multiple availability zones
+* **Auto-recovery**: Automatic recovery from multiple failure scenarios
+* **Rolling updates**: Enables to update redis pod settings gracefully

README.md

@@ -1,11 +1,6 @@
 # PayU Redis Operator
 
-Kubernetes operator that creates and manages Redis HA clustered databases - [Redis docs](https://redislabs.com/redis-enterprise/technology/redis-enterprise-cluster-architecture/).
-
-## Project status: Alpha
-
-The basic features have been completed, and while no breaking API changes are currently planned, the API can change in a backwards incompatible way before the project is declared stable and more features are expected for the stable version
-
+Kubernetes operator that creates and manages Redis HA clustered databases - [Redis docs](https://redislabs.com/redis-enterprise/technology/redis-enterprise-cluster-architecture/).<br>
 [ Feature state wiki page ](https://github.com/PayU/Redis-Operator/wiki/Feature-state)
 
 ### Using the operator on a local cluster