Add 7.0.0 changelog (#4531)
Add 7.0.0 changelog (#4531)


ascrutae/sky-walking,ascrutae/sky-walking,apache/skywalking,apache/skywalking,apache/skywalking,OpenSkywalking/skywalking,apache/skywalking,OpenSkywalking/skywalking,apache/skywalking,apache/skywalking,ascrutae/sky-walking,apache/skywalking,ascrutae/sky-walking