pull_request_template.md

Why this is needed

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Issue(s)

Please provide links to existing issues which are affected by this PR.

Pull request criteria

Please make sure that your pull request meets the following criteria, otherwise it might get rejected.

• Does your pull request fixes a bug or adds a new feature?
• Have you defined a new OAS3 specification in the ./examples/specs folder?
• Have you defined a corresponding test in ./src/oas3/specification/specification.test.ts?
• Have you defined a corresponding test in ./src/oas3/codegen/generate.test.ts?
• Does the least mentioned test generate outputs in the ./examples/outputs folder which are included in this PR?