Adding release notes for v0.5,v0.6 and v0.7 alpha release

docs/releases/0.5-NOTES.md

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+## Release notes for poseidon v0.5
+
+# Significant changes
+Static PV feature, Ephemeral storage feature and events feature.
+
+# Required Actions
+None
+
+# Highlighted changes
+* [Adding support for Static PV claim](https://github.com/kubernetes-sigs/poseidon/pull/136)
+* [Adding ephemeral storage support for Poseidon](https://github.com/kubernetes-sigs/poseidon/pull/137)
+* [Release events feature](https://github.com/kubernetes-sigs/poseidon/pull/138)
+
+# Full change list
+
+* [Adding release notes for v0.4 alpha release](https://github.com/kubernetes-sigs/poseidon/pull/132)
+* [Adding support for Static PV claim](https://github.com/kubernetes-sigs/poseidon/pull/136)
+* [Adding ephemeral storage support for Poseidon](https://github.com/kubernetes-sigs/poseidon/pull/137)
+* [Release events feature](https://github.com/kubernetes-sigs/poseidon/pull/138)
+* [add design docs ](https://github.com/kubernetes-sigs/poseidon/pull/140)
+* [Add design docs on taints and tolerations, gang scheduling](https://github.com/kubernetes-sigs/poseidon/pull/141)

docs/releases/0.6-NOTES.md

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+## Release notes for poseidon v0.6
+
+# Significant changes
+Gang Scheduling feature and feature to enable Poseidon/Firmament behave like default-scheduler.
+
+# Required Actions
+None
+
+# Highlighted changes
+* [Gang scheduling feature](https://github.com/kubernetes-sigs/poseidon/pull/148)
+* [Poseidon behave like default scheduler](https://github.com/kubernetes-sigs/poseidon/pull/149)
+
+# Full change list
+
+* [Add spelling check script and fix typos](https://github.com/kubernetes-sigs/poseidon/pull/142)
+* [fix `make` after running `dep ensure` and `hack/update-bazel.sh`](https://github.com/kubernetes-sigs/poseidon/pull/143)
+* [Fixed an issue in events](https://github.com/kubernetes-sigs/poseidon/pull/147)
+* [Gang scheduling feature](https://github.com/kubernetes-sigs/poseidon/pull/148)
+* [Poseidon behave like default scheduler](https://github.com/kubernetes-sigs/poseidon/pull/149)
+* [Remove the duplicate words](https://github.com/kubernetes-sigs/poseidon/pull/150)
+* [Fix typos: initialze->initialize, previsou->previous](https://github.com/kubernetes-sigs/poseidon/pull/151)
+* [Update the readme and added docs to run poseidon as default scheduler](https://github.com/kubernetes-sigs/poseidon/pull/152)
+* [Adding poseidon design markdown file](https://github.com/kubernetes-sigs/poseidon/pull/153)

docs/releases/0.7-NOTES.md

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+## Release notes for poseidon v0.7
+
+# Significant changes
+Max-Pods feature and PreferAvoidPods annotation feature.
+
+# Required Actions
+None
+
+# Highlighted changes
+* [Adding PreferAvoidPods annotation feature support in Poseidon/Firmament](https://github.com/kubernetes-sigs/poseidon/pull/165)
+* [Adding Max-pods Feature in Poseidon/Firmament](https://github.com/kubernetes-sigs/poseidon/pull/166)
+
+# Full change list
+
+* [Reverse release update information](https://github.com/kubernetes-sigs/poseidon/pull/154)
+* [Add Gitter Badge](https://github.com/kubernetes-sigs/poseidon/pull/160)
+* [Adding bechmark reports](https://github.com/kubernetes-sigs/poseidon/pull/161)
+* [Updating the benchmarking graph](https://github.com/kubernetes-sigs/poseidon/pull/162)
+* [Adding a flag to enable/disable success events from Poseidon](https://github.com/kubernetes-sigs/poseidon/pull/163)
+* [Ephemeral test case failure fix](https://github.com/kubernetes-sigs/poseidon/pull/164)
+* [Adding PreferAvoidPods annotation feature support in Poseidon/Firmament](https://github.com/kubernetes-sigs/poseidon/pull/165)
+* [Adding Max-pods Feature in Poseidon/Firmament](https://github.com/kubernetes-sigs/poseidon/pull/166)
+* [Adding E2E test case for max-pods](https://github.com/kubernetes-sigs/poseidon/pull/167)