Add Release Notes for 1.0.0-m1 release

etc/releaseNotes.md

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+## Release Notes
+
+## Apache ServiceComb Java-Chassis (Incubating) 1.0.0-m1
+
+### Major improvements:
+
+ - Java Chassis can now use Apollo as configuration center. Users can now
+change configurations like load balancing policy and those changes will
+come into effect on the fly.
+See [here](http://servicecomb.incubator.apache.org/users/dynamic-config/) for more
+details.
+
+ - Metrics was re-factored. We now uses events for collecting invocation data
+instead of Hystrix. This reduces the performance penalty of computing
+metrics.
+Metrics can now be fetched via '/metrics' using HTTP.
+See [here](http://servicecomb.incubator.apache.org/users/metrics-in-1.0.0-m1/) for
+more details.
+
+### Other Noticeable Changes:
+
+- The Java Chassis libraries are now under group "org.apache.servicecomb".
+- We provide out of the box metrics support now. Prometheus and Overwatch
+is supported.
+- Configuration center was re-factored and moved out from foundation.
+Support for Apollo was added.
+- Users can now use Object type for calling services.
+- Users can now use Generics for calling services.
+- Better integration with Spring MVC.
+- Upgraded to zipkin2 internally, Java Chassis can now work with zipkin
+server v1 and v2.
+- We are in the process of supporting reactive programming. Pojo consumer
+and provider now supports CompletableFutre.
+
+### For more detailed information please checkout [here](https://issues.apache.org/jira/secure/ReleaseNote.jspa?projectId=12321626&version=12342351)