add issue template (#137)

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+labels: bug, triage-me
+---
+
+Please answer these questions before submitting a bug report.
+
+### What version of the Exporter are you using?
+
+
+### What version of OpenCensus are you using?
+
+
+### What version of Go are you using?
+
+
+### What did you do?
+If possible, provide a recipe for reproducing the error.
+
+
+### What did you expect to see?
+
+
+### What did you see instead?
+
+
+### Additional context
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+labels: feature-request, triage-me
+---
+
+**NB:** Before opening a feature request against this repo, consider whether the feature should/could be implemented in exporter libraries in other languages. If so, please [open an issue on opencensus-specs](https://github.com/census-instrumentation/opencensus-specs/issues/new) first.
+
+
+
+**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.