Add issue templates

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: true

.github/ISSUE_TEMPLATE/data_quality_issue.md

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+---
+name: Data quality issue 
+about: Missing data, weird data, broken data 
+title: ''
+labels: 'data quality'
+assignees: 'nmdefries'
+---
+
+**Actual Behavior:**
+
+<!--Provide a description of the problem and a minimal reproducible example, if relevant. Please include the source and signal names, as well as sample observations, with geo region name, date, and data, demonstrating the problem.-->
+
+When I...
+
+**Expected behavior**
+
+<!--A clear and concise description of what you expected to happen.-->
+
+**Context**
+
+<!--Add any context about the problem here.-->

.github/ISSUE_TEMPLATE/source_signal_request.md

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+---
+name: 🚀 New Source or Signal 
+about: Suggest incorporation of a new source or signal
+title: ''
+labels: 'API addition'
+assignees: ''
+---
+
+<!--A clear and concise description of the source or signal you would like to add or modify, and how you imagine it working.-->
+
+It would be great if ...
+
+**Data details**
+
+<!--Please link and briefly describe the proposed source. How is the raw data made available? Describe the geographic and time resolution of the raw data. Which fields should be extracted? Please describe proposed processing of the data, especially if this is a variant of an existing source or signal. -->
+
+**Additional context**
+
+<!--Add any other context or screenshots about the feature request here.-->