Create templates for PRs, bugs and feature request (#71)

.github/ISSUE_TEMPLATE/BUG_REPORT.md

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+---
+name: Bug report
+about: Create a report to help us improve
+labels: bug
+
+---
+
+**Describe the bug**
+
+**Steps to reproduce**
+
+**Expected behavior**
+- [ ] <!-- Issue specific criteria -->
+- [ ] Tests verifying the fix are added
+
+**Additional context**
+
+**Estimation of size**: small/medium/big
+
+**Estimation of priority**: low/medium/high

.github/ISSUE_TEMPLATE/FEATURE_REQUEST.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+
+---
+
+**Please describe the feature**
+As a [type of user], I want [an action] so that [a benefit/a value].
+
+**Acceptance criteria**
+- [ ] <!--Placeholder for issue specific criterion-->
+- [ ] Tests verifying the changes are added
+
+**Additional context**
+
+**Estimation of size**: small/medium/big
+
+**Estimation of priority**: low/medium/high

.github/PULL_REQUEST_TEMPLATE.md

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+**Related issue(s) and PR(s)**  
+This PR closes [issue number].
+
+
+**Description**
+
+
+**How to test**