Start PR templates for existing projects and general PR (#8)

* Start PR templates for existing projects and general PR

* Add spec compliance requirement

.github/PULL_REQUEST_TEMPLATE/new_project_template.md

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+## New Project
+
+<< project description >>
+
+### Checklist
+
+**Acknowledgements**
+
+- [ ] I certify that I am authorized to assign ownership of this code to the OpenTelemetry project.
+- [ ] I acknowledge that ownership of the [Hex](https://hex.pm) package must be given/transferred to the [OpenTelemetry Hex Org](https://hex.pm/orgs/opentelemetry)
+
+
+**Project Type**
+
+- [ ] Instrumentation
+- [ ] Exporter
+- [ ] Propagator
+- [ ] Metapackage
+- [ ] Example
+- [ ] Util
+
+**Prior Art**
+
+- [ ] Is this an existing project? Includes private libraries being open sourced.
+  - [ ] Yes
+  - [ ] No
+- [ ] Are there any other packages on [Hex](https://hex.pm) providing similar functionality?
+
+**Existing Project**
+
+- [ ] Moving from an existing public repository? Provide a link in the description.
+- [ ] All authors who have contributed code contained in this PR have signed the [CNCF CLA](https://identity.linuxfoundation.org/projects/cncf)
+
+**All Projects**
+
+- [ ] Label created (maintainers)
+- [ ] [labeler.yml](https://github.com/open-telemetry/opentelemetry-erlang-contrib/blob/main/.github/labeler.yml) updated
+- [ ] CI
+  - [ ] Elixir or Erlang language file is updated
+  - [ ] Test strategy should use the matrix strategy with all supported language/OTP combinations
+  - [ ] The job is scoped to only run for relevant code changes
+- [ ] [Codeowners](https://github.com/open-telemetry/opentelemetry-erlang-contrib/blob/main/CODEOWNERS) adds scoped ownership for project maintainers
+- [ ] License file (Apache2 - copyright to OpenTelemetry Authors)
+- [ ] All code complies with the [Otel Specification](https://github.com/open-telemetry/opentelemetry-specification/tree/main/specification) and Otel Semantic Conventions - [Trace](https://github.com/open-telemetry/opentelemetry-specification/tree/main/specification/trace/semantic_conventions) [Metrics](https://github.com/open-telemetry/opentelemetry-specification/tree/main/specification/metrics/semantic_conventions)

.github/PULL_REQUEST_TEMPLATE/pull_request_template.md

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+### What does this PR do?
+