HDDS-5340. Put github PR template of ozone-go

[cxorm]

What changes were proposed in this pull request ?

Put github PR template of ozone-go.

What is the link to the Apache JIRA ?

https://issues.apache.org/jira/browse/HDDS-5340

How was this patch tested ?

I think we could not add test here if you don't mind ; )

[cxorm]

This PR is to address the following scene :
In the Apache Ozone repo, the jira number in commit history bar is linked to jira,
but in the Apache Ozone-go repo is not.

First I went to the asf yaml and not found something related. (Feel free to correct me if I miss anything), then I went through many Apache Project and I found those repo with this feature having pull_request_template.md.

So I guess it is the reason, let's try it.

[sky76093016]

I have also observed this problem before, thank @cxorm for fixing it!

[kaijchen]

This PR is to address the following scene :
In the Apache Ozone repo, the jira number in commit history bar is linked to jira,
but in the Apache Ozone-go repo is not.

I don't think this is related to the PR template.
But the PR template looks good.
Let's merge it.