chore: Add PR template and PR title CI (FlexibleEngineCloud#1051)

.github/PULL_REQUEST_TEMPLATE

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+<!-- Thanks for sending a pull request! -->
+
+**What this PR does / why we need it**:
+
+**Which issue this PR fixes**:
+*(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*
+fixes #xxx
+
+**Special notes for your reviewer**:
+
+**Release note**:
+<!--  Steps to write your release note:
+1. Use the release-note-* labels to set the release note state (if you have access)
+2. Enter your extended release note in the below block; leaving it blank means using the PR title as the release note. If no release note is required, just write `NONE`.
+-->
+
+```release-note
+
+```
+
+## PR Checklist
+
+* [ ] Tests added/passed.
+* [ ] Documentation updated.
+* [ ] Schema updated.
+
+## Acceptance Steps Performed
+
+```
+make testacc TEST='./flexibleengine' TESTARGS='-run=TestAccSomethingV0_basic'
+...
+=== RUN   TestAccSomethingV0_basic
+--- PASS: TestAccSomethingV0_basic (70.75s)
+PASS
+ok      github.com/FlexibleEngineCloud/terraform-provider-flexibleengine/flexibleengine       70.796s
+```

.github/workflows/pr_title.yml

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+name: 'Validate PR title'
+
+on:
+  pull_request_target:
+    types:
+      - opened
+      - edited
+      - synchronize
+
+jobs:
+  main:
+    name: Validate PR title
+    runs-on: ubuntu-latest
+    steps:
+      # Please look up the latest version from
+      # https://github.com/amannn/action-semantic-pull-request/releases
+      - uses: amannn/[email protected]
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          # Configure which types are allowed.
+          # Default: https://github.com/commitizen/conventional-commit-types
+          types: |
+            fix
+            feat
+            docs
+            ci
+            chore
+            refactor
+            test
+            style
+            changelog
+          # Configure that a scope must always be provided.
+          requireScope: false
+          # Configure additional validation for the subject based on a regex.
+          # This example ensures the subject starts with an uppercase character.
+          subjectPattern: ^[A-Za-z].+$
+          # If `subjectPattern` is configured, you can use this property to override
+          # the default error message that is shown when the pattern doesn't match.
+          # The variables `subject` and `title` can be used within the message.
+          subjectPatternError: |
+            The subject "{subject}" found in the pull request title "{title}"
+            didn't match the configured pattern. Please ensure that the subject
+            starts with a letter.
+          # For work-in-progress PRs you can typically use draft pull requests
+          # from Github. However, private repositories on the free plan don't have
+          # this option and therefore this action allows you to opt-in to using the
+          # special "[WIP]" prefix to indicate this state. This will avoid the
+          # validation of the PR title and the pull request checks remain pending.
+          # Note that a second check will be reported if this is enabled.
+          wip: true
+          # When using "Squash and merge" on a PR with only one commit, GitHub
+          # will suggest using that commit message instead of the PR title for the
+          # merge commit, and it's easy to commit this by mistake. Enable this option
+          # to also validate the commit message for one commit PRs.
+          validateSingleCommit: false
+          # If the PR contains one of these labels (newline delimited), the
+          # validation is skipped.
+          # If you want to rerun the validation when labels change, you might want
+          # to use the `labeled` and `unlabeled` event triggers in your workflow.
+          ignoreLabels: |
+            ignore-semantic-pull-request