Adds issue templates (#269)

* Adds templates

* adds config.yml

* updates feature request template

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Filling a bug report
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+## Common project specific issues
+
+There are certain project specific issues that are commonly misinterpreted as bugs.
+
+- [Offerings, products, or available packages are empty](https://support.revenuecat.com/hc/en-us/articles/360041793174)
+- [Invalid Play Store credentials errors](https://support.revenuecat.com/hc/en-us/articles/360046398913)
+- [Unable to connect to the App Store (STORE_PROBLEM) errors](https://support.revenuecat.com/hc/en-us/articles/360046399333)
+
+For support I'd recommend our [online community](https://spectrum.chat/revenuecat), [StackOverflow](https://stackoverflow.com/tags/revenuecat/) and/or [Help Center](https://support.revenuecat.com/hc/en-us) 👍
+
+If you have a clearly defined bug (with a [Minimal, Complete, and Reproducible example](https://stackoverflow.com/help/minimal-reproducible-example)) that is not specific to your project, follow the steps below to file it with RevenueCat. For SDK-related bugs, make sure they can be reproduced on a physical device, not a simulator (there are simulator-specific problems that prevent purchases from working).
+
+**Describe the bug**
+A clear and concise description of what the bug is. The more detail you can provide the faster our team will be able to triage and resolve the issue.
+
+1. Environment
+    1. Platform:
+    2. SDK version:
+    3. OS version:
+    4. XCode/Android Studio version:
+    5. How widespread is the issue. Percentage of devices affected.
+2. [Debug logs](https://docs.revenuecat.com/docs/debugging) that reproduce the issue
+3. Steps to reproduce, with a description of expected vs. actual behavior
+4. **Other information** (e.g. stacktraces, related issues, suggestions how to fix, links for us to have context, eg. stackoverflow, etc.)
+
+**Additional context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: Our online community
+    url: https://spectrum.chat/revenuecat
+    about: Please ask and answer questions here
+  - name: Our Help Center
+    url: https://support.revenuecat.com/hc/en-us
+    about: Get help from our support team
+  - name: Feature Request
+    url: https://support.revenuecat.com/hc/en-us/articles/360046422033-Feature-Requests 
+    about: Please use this instead of opening an issue. This is best channel that allows us to keep track of feature requests.
+  - name: Offerings, products, or available packages are empty
+    url: https://support.revenuecat.com/hc/en-us/articles/360041793174
+    about: Why are my products, offerings, or available packages empty?
+  - name: Invalid Play Store credentials errors
+    url: https://support.revenuecat.com/hc/en-us/articles/360046398913
+    about: How to solve Play Store credentials errors
+  - name: Unable to connect to the App Store (STORE_PROBLEM) errors
+    url: https://support.revenuecat.com/hc/en-us/articles/360046399333
+    about: Why I get STORE_PROBLEM errors
+

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: enhancement
+assignees: ''
+
+---
+
+Please use https://support.revenuecat.com/hc/en-us/articles/360046422033-Feature-Requests instead of opening an issue. That is the best channel that allows us to keep track of feature requests.

.github/PULL_REQUEST_TEMPLATE.md

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+Thank you for contributing to Purchases. Before pressing the "Create Pull Request" button, please provide the following:
+
+  - [ ] A description about what and why you are contributing, even if it's trivial.
+
+  - [ ] The issue number(s) or PR number(s) in the description if you are contributing in response to those.
+
+  - [ ] If applicable, unit tests.