Add issue & pull request templates (#6)

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: '[Affected functionality] Clear and concise summary, e.g. "[Create news] ''Publish''
+  button is not displayed on the ''Preview'' page"'
+labels: bug
+assignees: ''
+
+---
+
+**Environment:** OS, browser, it's version, device (for mobile devices).
+**Reproducible:** always, rarely, sometimes etc.
+**Build found:** last commit from https://github.com/ita-social-projects/OoS-Backend/tree/main
+E.g. "commit 147fa44"
+
+**Preconditions**
+A clear and concise description of actions to be done before the start of the bug reproducing (to make bug reproducing possible). E.g.:
+"Create an item in the database using SQL query:
+INSERT INTO table1 (column1, column2)
+VALUES (value1, value2);"
+
+**Steps to reproduce**
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+
+**Actual result**
+A clear and concise description of what happened (displayed, not displayed etc.)
+Attached bug screenshots or video recorded.
+
+**Expected result**
+A clear and concise description of what you expected to happen.
+Attached screenshots or mock-ups if available.
+
+**Postconditions**
+A clear and concise description of actions to be done after bug reproducing. E.g.:
+"Delete created item from database using SQL query:
+DELETE FROM table1
+WHERE id=<item1_id>;"
+
+**User story and test case links**
+E.g.: "User story #100
+[Test case]([#100 Story](https://github.com/ita-social-projects/OoS-Backend/issues/100))"
+
+**Labels to be added**
+"Bug", Priority ("pri: "), Severity ("severity:"), Type ("UI, "Functional"), "API" (for back-end bugs).

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false

.github/ISSUE_TEMPLATE/custom_template.md

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+---
+name: Custom template
+about: Blank template for other issue types
+title: ''
+labels: ''
+assignees: ''
+
+---

.github/ISSUE_TEMPLATE/task.md

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+---
+name: Task
+about: Describe task
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Story link**
+[#100 Story](https://github.com/ita-social-projects/OoS-Backend/issues/100)
+
+### Task description
+Show priority posts by api request
+
+### To do 
+1. - [ ] Implement api endpoint contorller for getting posts.
+2. - [ ] Implement service for getting all priority posts.
+3. - [ ] Implement repository for getting all priority posts.
+
+
+### [Estimating](https://example.com) 

.github/ISSUE_TEMPLATE/user-story.md

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+---
+name: User story
+about: Describe story goal
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**As a** <role> **I want to** <....> **so that** <...>
+
+**Description**
+Describe feature functionality
+Add mockup if needed
+
+### Acceptance Criteria
+A clear and concise description of what you want to happen.
+
+**Epic link**
+E.g.: Epic #100 [Epic](https://github.com/ita-social-projects/OoS-Backend/labels/100)
+
+**Labels to be added**
+"User story", Correspondind Functionality (e.g. User), Priority ("pri: "), "Corresponding Epic"
+
+### Tasks 
+1. - [ ] sample task.

.github/PULL_REQUEST_TEMPLATE/develop.md

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+develop
+## GitHub Board
+
+**Issue link**
+
+[#100 Issue name ](https://github.com/ita-social-projects/OoS-Backend/issues/100)
+
+**Story link**
+
+[#100 Story](https://github.com/ita-social-projects/OoS-Backend/issues/100)
+
+## Code reviewers
+
+- [ ] @github_username
+
+### Second Level Review
+
+- [ ] @github_username
+
+## Summary of issue
+
+ToDo
+
+## Summary of change
+
+ToDo
+
+## Testing approach
+
+ToDo
+## CHECK LIST
+- [ ]  СI passed
+- [ ]  Сode coverage >=80%
+- [ ]  PR is reviewed manually again (to make sure you have 100% ready code)
+- [ ]  All reviewers agreed to merge the PR
+- [ ]  I've checked new feature as logged in and logged out user if needed
+- [ ]  PR meets all conventions

.github/PULL_REQUEST_TEMPLATE/main.md

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+main
+## GitHub Board
+
+**Issue link**
+
+[#100 Issue name ](https://github.com/ita-social-projects/OoS-Backend/issues/100)
+
+**Story link**
+
+[#100 Story](https://github.com/ita-social-projects/OoS-Backend/issues/100)
+
+## Code reviewers
+
+- [ ] @github_username
+
+### Second Level Review
+
+- [ ] @github_username
+
+## Summary of issue
+
+ToDo
+
+## Summary of change
+
+ToDo
+
+## Testing approach
+
+ToDo
+## CHECK LIST
+- [ ]  СI passed
+- [ ]  Сode coverage >=80%
+- [ ]  PR is reviewed manually again (to make sure you have 100% ready code)
+- [ ]  All reviewers agreed to merge the PR
+- [ ]  I've checked new feature as logged in and logged out user if needed
+- [ ]  PR meets all conventions