Updates to ASA template - ReadMe, Pipeline Configs etc

[rajeshkamal5050]

No description provided.

[vhvb1989]

@yiliuTo , use this for all ASA templates mentioned in this issue
Azure-Samples/ASA-Samples-Event-Driven-Application#13 (comment)

[yiliuTo]

Hi @vhvb1989 thanks for helping modifying the devcontainer and github actions, and I have merged your PR to adopt the commit.
Besides, for the other 4 ASA templates, since we doesn't provide the support of dev container or github actions in the current stage, thus we cannot apply the modification to them. Thanks again!

[vhvb1989]

@yiliuTo , I think the only missing is: Azure-Samples/ASA-Samples-Web-Application#19

You just need to apply the same changes to that one

[yiliuTo]

@yiliuTo , I think the only missing is: Azure-Samples/ASA-Samples-Web-Application#19

You just need to apply the same changes to that one

@vhvb1989 sure