Update issue templates

Add bug report and feature request template

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,26 @@
+---
+name: Bug report
+about: Create a report to help us improve Pubmed Parser
+title: Bug report
+labels: bug
+assignees: ''
+
+---
+
+**Describe the bug**
+Please describe the unexpected outcome from Pubmed Parser here
+
+**To Reproduce**
+Please provide code to reproduce an issue and how to download the dataset or file
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Dependencies**
+ - Please provide OS and dependencies you use for Pubmed Parser (e.g. `lxml`, `unidecode`, `requests`)
+
+**Additional context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/feature_request.md

@@ -0,0 +1,20 @@
+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Describe alternatives you've considered**
+A clear and concise description of any alternative solutions or features you've considered.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.