Add issue template for GitHub

Author: bizz84

ISSUE_TEMPLATE.md

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+### Platform
+
+- [ ] iOS
+- [ ] macOS
+- [ ] tvOS
+
+### In app purchase type
+
+- [ ] Consumable
+- [ ] Non-consumable 
+- [ ] Auto-Renewable Subscription
+- [ ] Non-Renewing Subscription
+
+### Environment
+
+- [ ] Sandbox
+- [ ] Production
+
+### Version
+ℹ Please replace this with the version of SwiftyStoreKit you're using.
+
+## Report
+ℹ Please replace this with the reproduction steps for your issue.
+