GitHub: added PULL_REQEUEST_TEMPLATE for PR maintenance

This commit is to improve PR template (e.g., summary, goal, description,
reproduction, and so on) that can be submitted by contributers
to evolve the FauxPilot software.

**Changelog**
 * Version 2
  - Applied comments of reviewer(s)
  - Updated the sections of a PR writing guide for readability.

 * Version 1
  - Added Pull Request template

Signed-off-by: Geunsik Lim <leemgs@gmail.com>
Signed-off-by: Geunsik Lim <geunsik.lim@samsung.com>

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,27 @@
+---
+# [Template] PR Description
+
+In general, the github system duplicates your commit message automatically for your convenience.
+After composing your own PR description using this template, please remove any unneeded portions.
+```bash
+## 1. General Description
+The commit title must begin with one of the eleven given options.
+Build, chore, CI, documentation, task, fix, performance, refactor, revert, style, and test are some examples. 
+or more details, please see [HERE](https://www.conventionalcommits.org/en/v1.0.0/).
+Summarize changes in no more than 50 characters ASAP for readability and maintenance.
+
+## 2. Changes proposed in this PR:
+ - Bulleted lists are also acceptable. 
+ - Typically, a hyphen or asterisk before the bullet, followed by a single space.
+
+Resolves: #{GitHub-Issue-Number}
+See also: #{GitHub-Issue-Number}
+
+
+## 3. How to evaluate:
+1. Describe how to evaluate such that it may be reproduced by the reviewer (s).
+2. Self assessment:**
+ - Build test: [ ]Passed [ ]Failed [*]Skipped
+ - Run test: [ ]Passed [ ]Failed [* ]Skipped
+```
+