[#3] Add Default coding guidelines and CODEOWNERS

.github/CODEOWNERS

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+* @Oztechan/core-team

.github/auto_assign.yml

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+addAssignees: author

docs/CONTRIBUTING.md

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+# Contributing
+
+## Branch
+
+Branch name should start with `ISSUE_ID` and after the id there should be `-` then continues with description of branch or title of ticket. Use `_` for empty spaces.
+
+Example:
+
+```
+123-My_Cool_Feature_Or_Bug
+```
+
+## Commit Message
+
+Every commit message should match the following format `[Oztechan/TraceFit#ISSUE_ID] Commit message`
+
+Example:
+
+```
+[Oztechan/TraceFit#123] My cool feature
+```
+
+## Pull Request
+
+### Title
+
+Pull Request title should follow below format:
+
+```
+[Oztechan/TraceFit#ISSUE_ID] ISSUE_TITLE
+```
+
+Example:
+
+```
+[Oztechan/TraceFit#ISSUE_ID] Whatever the name of ticket is
+```
+
+### Description
+
+Description has to have `Resloves Oztechan/TraceFit#ISSUE_ID` with relevant issue. It will help automatically close relevant issue once the PR is merged.
+
+Example:
+
+```
+Resolves Oztechan/TraceFit#123
+
+Some description.
+```

docs/ISSUE_TEMPLATE.md

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+## Description
+
+<!--
+Issue Checklist
+1. I have added a valid description.
+2. If it is a bug, I have added how to reproduce it.
+-->

docs/PULL_REQUEST_TEMPLATE.md

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+## Description
+
+Resolves Oztechan/TraceFit*
+<!--
+Pull Request Checklist
+1. I have read the https://github.com/Oztechan/TraceFit/blob/develop/docs/CONTRIBUTING.md
+2. PR title in the format of `[Oztechan/TraceFit#ISSUE_ID] ISSUE_TITLE`
+3. I have added a valid description and 
+4. I replaced `*` with the link of the issue. Ie `#123` into description (it will automatically close issue once PR is merged)
+4. I have tested the app before creating this PR 
+-->