Add templates to github issues and PR

.github/ISSUE_TEMPLATE/bug-report.yml

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+name: Bug Report
+description: Create a report to help us improve
+labels: ["type: bug", "needs-triage"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for helping PyScript! 🐍
+
+        Going through bugs and issues takes up a lot of time, so please be so kind and take a few minutes to fill out all the areas to the best of your ability.
+
+        There will always be more issues than there is time to do them, and so we will need to selectively close issues that don't provide enough information, so we can focus our time on helping people like you who fill out the issue form completely. Thank you for your collaboration!
+
+        There are also already a lot of open issues, so please take 2 minutes and search through existing ones to see if what you are experiencing already exists.
+
+        Finally, if you are opening **a bug report related to PyScript.com** please [use this repository instead](https://github.com/anaconda/pyscript-dot-com-issues/issues/new/choose).
+
+        Thanks for helping PyScript be amazing. We are nothing without people like you helping build a better community 💐!
+  - type: checkboxes
+    id: checks
+    attributes:
+      label: Checklist
+      description: Please confirm and check all the following options.
+      options:
+        - label: I added a descriptive title
+          required: true
+        - label: I searched for other issues and couldn't find a solution or duplication
+          required: true
+  - type: textarea
+    id: what-happened
+    attributes:
+      label: What happened?
+      description: And what should have happened instead? This really helps everyone review quicker and greatly increases the chance that someone can get around to solve your issue
+      placeholder: Tell us what you see!
+    validations:
+      required: true
+  - type: dropdown
+    id: browsers
+    attributes:
+      label: What browsers are you seeing the problem on? (if applicable)
+      multiple: true
+      options:
+        - Firefox
+        - Chrome
+        - Safari
+        - Microsoft Edge
+        - Other
+    validations:
+      required: false
+  - type: textarea
+    id: context
+    attributes:
+      label: Additional Context
+      description: Add any additional context information or screenshots you think are useful.

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: true

.github/PULL_REQUEST_TEMPLATE.md

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+## Description
+
+<!--Please describe the changes in your pull request in few words here. -->
+
+## Changes
+
+<!-- List the changes done to fix a bug or introduce a new feature.Please note both user-facing changes and changes to internal API's here -->