Add more descriptions about project.

Update version to 5.0.0-alpha

Update readme and remove the annoucement

[Collector] Fix issue that collector start failed in the Windows environment

[Agent] Fix issue that OkHttpClient plugin doesn't work

[Agent] fix jedis testcase failed

[Agent] Fix the enhance class is incorrect

[Agent] Cannot propagate the context across threads

add relocation config of org.apache.http and org.apache.commons package

fix issue that the intercept class package name  is incorrect

fix issue that the intercept class and the enhance class package name of the trace annotation plugin  is incorrect