modify contributing markdown and add pull request template markdown for github
diff --git a/pull_request_template.md b/pull_request_template.md
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+#### Instructions for Apache Thrift Pull Requests ####
+
+1. All code changes require an [Apache Jira THRIFT Issue](http://issues.apache.org/jira/browse/THRIFT) ticket.
+
+1. All pull requests should contain a single commit per issue, or we will ask you to squash it.
+1. The pull request title must begin with the Jira THRIFT ticket identifier, for example:
+
+ THRIFT-9999: an example pull request title
+
+1. Commit messages must follow this pattern for code changes (deviations will not be merged):
+
+ THRIFT-9999: [summary of fix, one line if possible]
+ Client: [language(s) affected, comma separated, use lib/ directory names please]
+
+1. Remove these instructions from any pull request description.
+
+For more information about committing, see [CONTRIBUTING](CONTRIBUTING.md).
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