added template

Author: sn99

.github/pull_request_template.md

@@ -0,0 +1,5 @@
+- [ ] I have read [CONTRIBUTING.md](https://github.com/sn99/rust-practise-questions/blob/master/CONTRIBUTING.md)
+- [ ] Link to solution is : PLAYGROUND_LINK
+- [ ] This is not a ReWrite of an included question concept
+
+Thank you for Contributing

CONTRIBUTING.md

@@ -8,4 +8,5 @@ All the questions are in the following format `src/chapterX/questions.md`
 
 All your contributions will be considered under [MIT LICENSE](LICENSE)
 
-Finally execute `mdbook build` after adding questions (provide one solution in [playground](https://play.rust-lang.org/))
+Finally execute `mdbook build` after adding questions (provide one solution in [playground](https://play.rust-lang.org/)) and try not 
+include questions that convey the same concept