Add changelog (#331)

Adds a changelog, which uses the same common format as other OCI tools.
I've backported all 2.x releases.

Author: briangustafson

CHANGELOG.md

@@ -0,0 +1,70 @@
+# Change Log
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](http://keepachangelog.com/).
+
+## Unreleased
+
+### Added
+- Filters for most core, IAM, and Load Balancer data sources
+- Support for Virtual Machine (VM) DB Systems
+- Support for Bring Your Own License (BYOL) licensing model for DB Systems
+
+### Notes
+- If upgrading from v1, see [this wiki](https://github.com/oracle/terraform-provider-oci/wiki/Oracle-Terraform-Provider-Name-Change) for migration steps.
+- See docs for this version [here](https://github.com/oracle/terraform-provider-oci/tree/v2.0.3).
+
+## 2.0.2 - 2017-10-12
+
+### Fixed
+- Optimize service error retry behavior (#179)
+- Object store fixes (#225)
+- Properly handle version date in policies, ignore format changes when diffing (#230)
+- Ignore case for DNS Labels (#279)
+- Oci-tool migration tool fixes (#298) (#292)
+
+### Added
+- Support update and refresh on Instance and Vnic details
+- File upload example
+- Block volumes support for size in gigabytes (#297)
+- Support for compartment renaming (#250)
+
+### Changed
+- Handle and log URL parsing errors (#277)
+- Minor update to bmcs-go-sdk license
+- Acceptance test refinements
+
+### Notes
+- If upgrading from v1, see [this wiki](https://github.com/oracle/terraform-provider-oci/wiki/Oracle-Terraform-Provider-Name-Change) for migration steps.
+- See docs for this version [here](https://github.com/oracle/terraform-provider-oci/tree/2.0.2).
+
+## 2.0.1 - 2017-9-26
+
+### Fixed
+- Resources are now removed from the state file if in a "terminated" state so that it is recreated on an apply (#113)
+- Enable empty route rules (#68)
+- Fix import of Subnet prohibit_public_ip_on_vnic
+- Adds pagination to all IAM data sources
+- General fixes for plans including compartments as a resource
+
+### Added
+- VNIC skip_source_dest_check property
+
+### Notes
+- If upgrading from v1, see [this wiki](https://github.com/oracle/terraform-provider-oci/wiki/Oracle-Terraform-Provider-Name-Change) for migration steps.
+- See docs for this version [here](https://github.com/oracle/terraform-provider-oci/tree/v2.0.1).
+
+## 2.0.0 - 2017-9-13
+
+### Changed
+- Changes name from terraform-provider-baremetal to terraform-provider-oci. See [this wiki](https://github.com/oracle/terraform-provider-oci/wiki/Oracle-Terraform-Provider-Name-Change) on migration steps and associated migration tool usage instructions.
+
+### Added
+* Support for Secondary Private IPs
+
+### Notes
+- If upgrading from v1, see [this wiki](https://github.com/oracle/terraform-provider-oci/wiki/Oracle-Terraform-Provider-Name-Change) for migration steps.
+- See docs for this version [here](https://github.com/oracle/terraform-provider-oci/tree/v2.0.0).
+
+## Earlier Versions
+- For earlier versions, see [releases](https://github.com/oracle/terraform-provider-oci/releases).