Added bug report and feature request templates (#178)

Author: nwithan8

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: Bug Report
+description: File a bug report
+title: "[Bug]: "
+labels: [ "triage" ]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thank you for taking the time to report an issue in this repository. Please fill out the form below.
+  - type: input
+    id: software-version
+    attributes:
+      label: Software Version
+      # change this description for the specific repo
+      description: |
+        What version of our software are you running?
+        TIP: [Available versions](https://github.com/EasyPost/easypost-python/releases)
+    validations:
+      required: true
+  - type: input
+    id: language-version
+    attributes:
+      label: Language Version
+      # change this description for the specific language of the repo
+      description: |
+        What language version and/or framework are you using?
+        TIP: [How to find your Python version](https://stackoverflow.com/questions/1093322/how-do-i-check-what-version-of-python-is-running-my-script)
+    validations:
+      required: true
+  - type: input
+    id: os
+    attributes:
+      label: Operating System
+      description: What operating system are you running the software on?
+    validations:
+      required: true
+  - type: textarea
+    id: behavior
+    attributes:
+      label: What happened?
+      description: |
+        Please describe what happened in reproducible steps.
+        Include how often you see this issue, and any relevant links (i.e. GitHub issue, Stack Overflow, etc.).
+      value: |
+        1.
+        2.
+        3.
+        ...
+    validations:
+      required: true
+  - type: textarea
+    id: expected-behavior
+    attributes:
+      label: What was expected?
+      description: Please describe what was expected to happen instead.
+    validations:
+      required: true
+  - type: textarea
+    id: sample-code
+    attributes:
+      label: Sample Code
+      description: |
+        Please provide any sample code that demonstrates the behavior.
+        This will be automatically formatted into the appropriate language, so no need for backticks.
+        **Do not include any private information such as API keys or passwords.**
+      # change this render to the appropriate language: https://github.com/github/linguist/blob/master/lib/linguist/languages.yml
+      render: python3
+    validations:
+      required: false
+  - type: textarea
+    id: logs
+    attributes:
+      label: Relevant logs
+      description: |
+        Please copy and paste any relevant log output.
+        This will be automatically formatted into shell output, so no need for backticks.
+        If you have screenshots instead, please paste them below.
+        **Do not include any private information such as API keys or passwords.**
+      render: sh
+    validations:
+      required: false

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: Feature Request
+description: Request a new feature
+title: "[Feat]: "
+labels: [ "triage" ]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thank you for taking the time to request a new feature.
+        Please note, all feature requests are subject to review and approval.
+        We welcome all suggestions and ideas, but we cannot guarantee when or if we will implement them.
+        
+        We also welcome pull requests, if you would like to implement the feature yourself.
+        Doing so will likely accelerate the process of implementing the requested feature.
+  - type: checkboxes
+    id: searched
+    attributes:
+      label: Feature Request Is New
+      # change issue link below for the specific repo
+      description: |
+        Before we begin, please confirm that the requested feature does not already exist or has not [already been requested](https://github.com/EasyPost/easypost-python/issues).
+      options:
+        - label: I have verified that the requested feature does not already exist or has not already been requested.
+          required: true
+  - type: textarea
+    id: description
+    attributes:
+      label: Description of the feature
+      description: |
+        Please provide a detailed description of the feature, including:
+        - What the feature is
+        - What value it adds to the application
+        - How it should be implemented (i.e. pseudo-code, or a high-level description of the user experience)
+        - Any other relevant information
+    validations:
+      required: true
+