Add pull request template to each repository

[DiamondDragon]

When pull request template is created important information must be added to description. In order to simplify this activity it's suggested to create .github folder and pull template named PULL_REQUEST_TEMPLATE.md.

More details can be found here:

• https://docs.github.com/en/github/building-a-strong-community/creating-a-pull-request-template-for-your-repository
• https://embeddedartistry.com/blog/2017/08/04/a-github-pull-request-template-for-your-projects/

[DiamondDragon]

Here is how pull request template content may look like:

##### CHANGE TYPE
<!--- MANDATORY: Delete the items that don't apply -->
 - Patch
 - Minor
 - Major

##### GitHub issue link
<!--- MANDATORY: Add the GitHub issue url here -->

##### IMPACT, DEPENDENCIES AND TEST CONSIDERATIONS
<!--- Describe the likely impact of this change -->
<!--- Describe any dependencies this change may have on other changes in the pipeline, if any -->

[Pavel-Lapatin]

Bug report and feature request template should be changed:

1. Prioraty should be removed from bug report.
2. Acceptance Creteria should be removed from feature request.