Add github setup

.github/CODEOWNERS

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+*       @krzyzanowskim

.github/ISSUE_TEMPLATE.md

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+# Details
+
+- CryptoSwift version: 
+- Swift version: 
+- Platform version: 
+	- [ ] iOS/tvOS/watchOS
+	- [ ] macOS
+	- [ ] Linux
+- Installation: 
+	- [ ] CocoaPods
+	- [ ] Carthage
+	- [ ] Swift Package Manager
+	- [ ] Manual
+- [ ] [I'm a supporter](https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=92Z6U3LBHF9J4)
+
+# Description
+
+
+# Steps to reproduce
+
+
+Sample code:
+
+```swift
+import CryptoSwift
+
+
+```