chore: add issue templates (#124)

Author: shubha-rajan

.github/ISSUE_TEMPLATE/bug-report.md

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+---
+name: Bug Report
+about: Report defective or unintentional behavior you've experienced.
+title: "Brief summary of what bug or error was observed"
+labels: 'type: bug'
+
+---
+
+<!--
+
+Thanks for stopping by to let us know something could be better!
+
+**PLEASE READ**: If you have a support contract with Google, please create an 
+issue in the [support console](https://cloud.google.com/support/) instead of 
+filing on GitHub. This will ensure a timely response.
+
+Please run down the following list and make sure you've tried the usual "quick fixes":
+
+  - Search the issues already opened: https://github.com/GoogleCloudPlatform/cloud-sql-python-connector/issues
+  - Check for answers on StackOverflow: https://stackoverflow.com/questions/tagged/google-cloud-sql
+
+If you are still having issues, please include as much information as possible:
+
+--> 
+
+## Bug Description
+
+Please enter a detailed description of the bug, and any information about what 
+behavior you noticed and why it is defective or unintentional. 
+
+## Example code (or command)
+
+```python
+// example
+```
+
+## Stacktrace
+```
+Any relevant stacktrace here. Be sure to filter sensitive information.
+```
+
+## How to reproduce
+
+  1. ?
+  2. ?
+
+## Environment
+
+1. OS type and version: <YOUR_OS_HERE>
+2. Python version: `python --version`
+2. Connector version: <YOUR_VERSION_HERE> 

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+- name: Cloud SQL Issue tracker
+  url: https://issuetracker.google.com/savedsearches/559773
+  about: Please use the Cloud SQL Issue tracker for problems with Cloud SQL itself.
+- name: StackOverflow
+  url: https://stackoverflow.com/questions/tagged/google-cloud-sql
+  about: Please use the `google-cloud-sql` tag for questions on StackOverflow.

.github/ISSUE_TEMPLATE/documentation-issue.md

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+---
+name: Documentation Issue
+about: Report wrong or missing information with the documentation in the repo.
+title: "Brief summary of what is missing or incorrect"
+labels: 'type: docs'
+
+---
+
+<!--
+
+Thanks for stopping by to let us know something could be better!
+
+**PLEASE READ**: If you have a support contract with Google, please create an 
+issue in the [support console](https://cloud.google.com/support/) instead of 
+filing on GitHub. This will ensure a timely response.
+
+Please run down the following list and make sure you've tried the usual "quick fixes":
+
+  - Search the issues already opened: https://github.com/GoogleCloudPlatform/cloud-sql-python-connector/issues
+  - Check for answers on StackOverflow: https://stackoverflow.com/questions/tagged/google-cloud-sql
+
+If you are still having issues, please include as much information as possible:
+
+--> 
+## Description
+Provide a short description of what is missing or incorrect, as well as a link to the specific location of the information. 
+
+## Solution
+What would you prefer the documentation say? Why would this information be more accurate or helpful? 
+
+## Additional Context
+Please reference any other relevant issues, PRs, descriptions, or screenshots here.

.github/ISSUE_TEMPLATE/feature-request.md

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+---
+name: Feature Request
+about: Suggest an idea for new or improved behavior.
+title: "Brief summary of the proposed feature"
+labels: 'type: feature request'
+
+---
+
+<!--
+
+Thanks for stopping by to let us know something could be better!
+
+**PLEASE READ**: If you have a support contract with Google, please create an 
+issue in the [support console](https://cloud.google.com/support/) instead of 
+filing on GitHub. This will ensure a timely response.
+
+Please run down the following list and make sure you've tried the usual "quick fixes":
+
+  - Search the issues already opened: https://github.com/GoogleCloudPlatform/cloud-sql-python-connector/issues
+  - Check for answers on StackOverflow: https://stackoverflow.com/questions/tagged/google-cloud-sql
+
+If you are still having issues, please include as much information as possible:
+
+--> 
+## Feature Description
+A clear and concise description of what feature you would like to see, and why it would be useful to have added.
+
+## Alternatives Considered
+Are there any workaround or third party tools to replicate this behavior? Why would adding this feature be preferred over them? 
+
+## Additional Context
+Please reference any other issues, PRs, descriptions, or screenshots here.

.github/ISSUE_TEMPLATE/question.md

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+---
+name: Question
+about: Questions on how something works or the best way to do something. 
+title: "Brief summary of your question"
+labels: 'type: question'
+
+---
+
+<!--
+
+  Thanks for stopping by to let us know something could be better!
+
+**PLEASE READ**: If you have a support contract with Google, please create an
+  issue in the [support console](https://cloud.google.com/support/) instead of
+  filing on GitHub. This will ensure a timely response.
+
+         Please run down the following list and make sure you've tried the usual "quick fixes":
+
+         - Search the issues already opened: https://github.com/GoogleCloudPlatform/cloud-sql-python-connector/issues
+         - Check for answers on StackOverflow: https://stackoverflow.com/questions/tagged/google-cloud-sql
+
+         If you are still having issues, please include as much information as possible:
+
+  -->
+  
+## Question
+What's your question? Please provide as much relevant information as possible
+to reduce turnaround time. 
+
+## Additional Context
+Please reference any other relevant issues, PRs, descriptions, or screenshots here.