new github issue and pr templates (ethereum#75)

* new issue and pr templates

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: Bug Report
+description: File a bug report
+labels: ["bug"]
+body:
+  - type: markdown
+    attributes:
+      value: "## What was wrong"
+  - type: textarea
+    id: what-happened
+    attributes:
+      label: What happened?
+      description: Also tell us what you expected to happen
+    validations:
+      required: true
+  - type: textarea
+    id: code-that-caused
+    attributes:
+      label: Code that produced the error
+      description: Formats to Python, no backticks needed
+      render: python
+    validations:
+      required: false
+  - type: textarea
+    id: error-output
+    attributes:
+      label: Full error output
+      description: Formats to shell, no backticks needed
+      render: shell
+    validations:
+      required: false
+  - type: markdown
+    attributes:
+      value: "## Potential Solutions"
+  - type: textarea
+    id: how-to-fix
+    attributes:
+      label: Fill this section in if you know how this could or should be fixed
+      description: Include any relevant examples or reference material
+    validations:
+      required: false
+  - type: input
+    id: lib-version
+    attributes:
+      label: <PYPI_NAME> Version
+      description: Which version of <PYPI_NAME> are you using?
+      placeholder: x.x.x
+    validations:
+      required: false
+  - type: input
+    id: py-version
+    attributes:
+      label: Python Version
+      description: Which version of Python are you using?
+      placeholder: x.x.x
+    validations:
+      required: false
+  - type: input
+    id: os
+    attributes:
+      label: Operating System
+      description: Which operating system are you using?
+      placeholder: osx/linux/win
+    validations:
+      required: false
+  - type: textarea
+    id: pip-freeze
+    attributes:
+      label: Output from pip-freeze
+      description: Run `pip-freeze` and paste the output below
+      render: shell

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: true
+contact_links:
+  - name: Questions about using <REPO_NAME>?
+    url: https://discord.gg/GHryRvPB84
+    about: You can ask and answer usage questions on the Ethereum Python Community Discord

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: Feature Request
+description: Request a new feature
+labels: ["feature_request"]
+body:
+  - type: textarea
+    id: feature-description
+    attributes:
+      label: What feature should we add?
+      description: Include any relevant examples or reference material
+    validations:
+      required: true

.github/pull_request_template.md

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+### What was wrong?
+
+Related to Issue #
+Closes Issue #
+
+### How was it fixed?
+
+### Todo:
+- [ ] Clean up commit history
+
+- [ ] Add or update documentation related to these changes
+
+- [ ] Add entry to the [release notes](https://github.com/ethereum/web3.py/blob/master/newsfragments/README.md)
+
+#### Cute Animal Picture
+
+![Put a link to a cute animal picture inside the parenthesis-->]()