Create PULL_REQUEST_TEMPLATE.md

.github/PULL_REQUEST_TEMPLATE.md

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+Erase this information and put your Pull Request comments here 
+---
+
+Instructions for Issuing a Pull Request to sst-macro
+----------------------------------------------------
+
+1 - Verify that the Pull Request is targeted to the **devel** branch of sstsimulator/sst-macro
+
+2 - Verify that Source branch is up to date with the devel branch of sst-macro
+
+3 - After submitting your Pull Request:
+   * Automatic Testing will commence in a short while 
+      * Pull Requests will be tested with the devel branches of the sst-core and sst-sqe repositories
+         * These branches are syncronized with the devel branch of sst-macro.  This is why is it important to keep your source branch up to date.
+      * If testing passes, the source branch will be automatically merged (if possible)
+         * Pull Requests from forks will not be automatically tested until the code is inspected.
+         * Pull Requests from forks will not be automatically merged into the devel branch.
+      * If testing fails, You will be notified of the test results.  
+         * The Pull Request will be retested on a regular basis - Changes to the source branch can be made to correct problems
+
+----