docs: add CHANGELOG.md

Signed-off-by: Lalith Suresh <[email protected]>

CHANGELOG.md

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+## Changelog
+
+
+# Release 0.8.0
+
+* Public API changes:
+  * Objective functios no longer need to be scalar expressions, but
+    can be any column expression. Each value in the column will be
+    treated as an objective function. (#81, #82)
+* Issues fixed: #41, 81, #82, #85, #86
+
+
+# Release 0.7.1
+
+* API improvements
+  * A fetcher API for supplying input data to tables: https://github.com/vmware/declarative-cluster-management/commit/bfdbb7951aa4944e770fef5e5a16318ad12778e8
+  * Reworks exceptions thrown by the compiler and solver (#73, #74).
+* Bug fixes: 
+  * dcm: `all_equal()` now correctly works against variable columns
+  * dcm: fixes capacity constraint bugs related to empty domains, working with bigint/long columns, overflows, and divide by zeroes (#73, #75)
+  * k8s-scheduler: use pod_info.uid to uniquely identify pods because pod_info.name is not unique across namespaces (#72)
+