[Git] Format pull request template and add more OpenFPGA-related topics

.github/PULL_REQUEST_TEMPLATE/pull_request_template.md

@@ -3,19 +3,31 @@ name: Pull request
 about: Push a change to this project
 ---
 
-**Motivate of the pull request **
+##Motivate of the pull request
 - [ ] To address an existing issue. If so, please provide a link to the issue.
 - [ ] Breaking new feature. If so, please decribe details in the description part.
 
-**Describe the technical details**
+## **Describe the technical details**
 - What is currently done? (Provide issue link if applicable)
 - What does this pull request change?
 
-**Checklist of the pull request**
-- [ ] Require code changes
+##Which part of the code base require a change
+**In general, modification on existing submodules are not acceptable. You should push changes to upstream.**
+- [ ] VPR
+- [ ] OpenFPGA libraries
+- [ ] FPGA-Verilog
+- [ ] FPGA-Bitstream
+- [ ] FPGA-SDC
+- [ ] FPGA-SPICE
+- [ ] Flow scripts
+- [ ] Architecture library
+- [ ] Cell library
+
+##Checklist of the pull request
+- [ ] Require code changes. 
 - [ ] Require new tests to be added
 - [ ] Require an update on documentation
 
-**Impact of the pull request**
+##Impact of the pull request
 - [ ] Require a change on Quality of Results (QoR)
-- [ ] Require potential code changes for external users (break back-compatibility). If so, please list who may be influenced.
+- [ ] Break back-compatibility. If so, please list who may be influenced.