Improve readme

Change-Id: I3aa75446c44342c46a373d6571c49525e2cbd550
Update feature list

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Add link to sm

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Change-Id: If0889407a2127addbe16b52de4c99ceb99ee0adb
up links in rel notes

Change-Id: I27a72f79f66749a1e58a51df474c64f919d4b0d3
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Change-Id: I5d6da091202e47b7e9f85a1e00735e165ea8f393
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Change-Id: I9e1adc34c5b8e6d87de2d955eb9a31a675d506df