Added CHANGELOG.md file

CHANGELOG.md

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+## 1.2.2 (February 26, 2020)
+
+ENHANCEMENTS:
+
+* resource/ibm_is_vpc: Improved error message for VPC creation ([#1106](https://github.com/IBM-Cloud/terraform-provider-ibm/pull/1106))
+* resource/ibm_is_ssh_key: Improved error message for VPC SSH Key creation ([#1105](https://github.com/IBM-Cloud/terraform-provider-ibm/pull/1105))
+* resource/ibm_container_cluster : Added gateway feature support for IKS clusters. This feature helps to create a cluster with a gateway worker pool of two gateway worker nodes that are connected to public and private VLANs to provide limited public access, and a compute worker pool of compute worker nodes that are connected to the private VLAN only. 
+([#1125](https://github.com/IBM-Cloud/terraform-provider-ibm/pull/1125))
+* data/ibm_conatiner_cluster_config : Extended the data source to provide additional attribute like admin_key, admin_certificate, ca_certificate, host and token. This attributes helps to connect to other providers like Kubernetes and Helm without loading cluster config file. ([#895](https://github.com/IBM-Cloud/terraform-provider-ibm/issues/895))
+
+BUG FIXES:
+
+* doc/ibm_certificate_manager_order: Changed the type of rotate_key from string to bool ([#1110](https://github.com/IBM-Cloud/terraform-provider-ibm/pull/1110))
+* resource/ibm_is_instance: Fix for updating security group for primary network interface for vpc instance. Now users can add or delete security groups([#1078](https://github.com/IBM-Cloud/terraform-provider-ibm/issues/1078))
+* doc/ibm_resource_key : Provided an example in the docs as a workaround to create credentials using serviceID parameter ([#1121](https://github.com/IBM-Cloud/terraform-provider-ibm/pull/1121))
+* resource/ibm_is_network_acl : Fix for crash during the update of rules. Fix for the order of rules creation. Now users can add or delete rules for network_acl ([#1117](https://github.com/IBM-Cloud/terraform-provider-ibm/issues/1117))
+* resource/ibm_is_public_gateway : Added support for resource group and tags parameters ([#1102](https://github.com/IBM-Cloud/terraform-provider-ibm/issues/1102))
+* resource/ibm_is_floating_ip : Added support for tags parameters ([#1131](https://github.com/IBM-Cloud/terraform-provider-ibm/pull/1131))
+* resource/ibm_database : Parameters remote_leader_id, key_protect_instance and key_protect_key can’t be updated after creation. ([#1111](https://github.com/IBM-Cloud/terraform-provider-ibm/issues/1111))
+* example/ibm-key-protect : Updated example to create an authorisation policy between COS and Key Protect instance([#1133](https://github.com/IBM-Cloud/terraform-provider-ibm/pull/1133))
+* resource/ibm_resource_group: Removed suppression of error during deletion ([#1108](https://github.com/IBM-Cloud/terraform-provider-ibm/pull/1108))
+* resource/ibm_iam_user_invite : Fix for inviting user from IBM Cloud lite account. ([#1114](https://github.com/IBM-Cloud/terraform-provider-ibm/issues/1114))
+
+