Adding release notes for V0.7 alpha release

Author: shivramsrivastava

docs/releases/0.7-NOTES.md

@@ -0,0 +1,36 @@
+## Release notes for firmament v0.7
+
+# Significant changes
+
+* Adding Max-Pods feature and PreferAvoid pods feature support.
+
+# Required Actions
+
+To enable the new CPU-MEM cost model ```--flow_scheduling_cost_model```
+flag should be set to '10'
+like shown below
+
+```--flow_scheduling_cost_model=10```
+
+To enable the Pod Affinity/Anti-Affinity symmetry ```--pod_affinity_antiaffinity_symmetry```
+flag should be set to 'true' in the firmament config file 
+like show below 
+
+```firmament_scheduler_cpu_mem.cfg=true```
+
+This fix is based above the CPU-MEM cost model.
+This feature currently are not supported in other cost model.
+
+# Highlighted changes
+
+* [PreferAvoid pods feature](https://github.com/Huawei-PaaS/firmament/pull/26)
+* [Max-Pods feature support in firmament](https://github.com/Huawei-PaaS/firmament/pull/27)
+
+
+# Full change list
+
+* [Update Readme](https://github.com/Huawei-PaaS/firmament/pull/21)
+* [Ephemeral overcommit issue fix](https://github.com/Huawei-PaaS/firmament/pull/25)
+* [PreferAvoid pods feature](https://github.com/Huawei-PaaS/firmament/pull/26)
+* [Max-Pods feature support in firmament](https://github.com/Huawei-PaaS/firmament/pull/27)
+