Major 2.0 (#20)

* New 2.0 version + DependencyInjection library

* Updated docs and repo settings (devcontainers, vscode, github, etc.)

* Added tests

* Fixed bugs

* Minor test project refactoring

* Updated projects
- Added symbol packages
- Updated package versions to pre-release

* Updated SECURITY.md

* Added GitHub Actions workflows

.github/pull_request_template.md

@@ -1,10 +1,11 @@
-Fixes: 
+## Description
+<!--Put short description of the pull request here-->
 
-## Changelog
-- Item 1
-- Item 2
-- Item 3
+### Changelog
+<!-- - e.g. Updated `PackageVersion` from `1.0.0` to `1.1.0` -->
 
-## PR Checklist
-- [ ] Update package version and release notes
-- [ ] Tests and documentation
+Resolves: #issue_number
+
+<!-- IMPORTANT -->
+<!-- Before submitting a pull request, make sure, that there's an issue related to it, and that you are assigned. -->
+<!-- Visit https://github.com/xfox111/SimpleOTP/blob/main/CONTRIBUTING.md for more information. -->