docs(template): create proposal issue (#360)

.github/ISSUE_TEMPLATE/proposal.md

@@ -0,0 +1,24 @@
+---
+name: Proposal
+about: Wanted to add Algorithm. This issue best for you...
+title: '[Algorithm name] in [language]'
+labels: Proposal
+assignees: ''
+
+---
+
+## Information about Algorithm
+<!--
+i.e: What the given algorithm do and i.e. Type of algorithm array,stack
+-->
+(Type here)
+### Have you read the [Contributing.md](https://github.com/MakeContributions/DSA/blob/main/CONTRIBUTING.md) and [Code of conduct](https://github.com/MakeContributions/DSA/blob/main/CODE_OF_CONDUCT.md)
+<!-- Choose any one of them -->
+- [ ] Yes
+- [ ] No
+
+## Other context
+<!--
+This is a competitive platform problem i.e. Hackerrank,Codechef,GeeksforGeeks,Leetcode,Codeforce 
+-->
+(Type here)