Merge pull request #80 from Stanford-NavLab/derek/new-issues

Add new issue templates following contributing guide

Author: kanhereashwin

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Propose a new feature
+title: ''
+labels: enhancement
+assignees: ''
+
+---
+
+**Describe the proposed feature**
+Explain in detail the intended feature, its purpose and how it would work.
+Keep the scope as narrow as possible, which will make it easier to implement.
+
+**Motivate the proposed feature**
+Help us understand why the proposed feature would help you and/or make `gnss_lib_py` easier to use.

.github/ISSUE_TEMPLATE/usage_feedback.md

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+---
+name: Usage feedback
+about: Let us know if gnss_lib_py has been helpful to you!
+title: ''
+labels: usage feedback
+assignees: ''
+
+---
+
+**Functionality Usage**
+What specific functionalities of `gnss_lib_py ` do you use the most?
+
+**Application Usage**
+Are you using `gnss_lib_py` for a specific application or course?
+
+**Suggested Changes**
+Is there anything about `gnss_lib_py` that you would change?
+
+**Usage Intuition**
+Is there anything you find particular confusing about how to use `gnss_lib_py`?