Update README.md

Author: swiftuiux

README.md

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 The service creates sequence of the delays (nanoseconds) according to chosen strategy 
 
+[![](https://img.shields.io/endpoint?url=https%3A%2F%2Fswiftpackageindex.com%2Fapi%2Fpackages%2FThe-Igor%2Fretry-policy-service%2Fbadge%3Ftype%3Dswift-versions)](https://swiftpackageindex.com/The-Igor/retry-policy-service) 
+[![](https://img.shields.io/endpoint?url=https%3A%2F%2Fswiftpackageindex.com%2Fapi%2Fpackages%2FThe-Igor%2Fretry-policy-service%2Fbadge%3Ftype%3Dplatforms)](https://swiftpackageindex.com/The-Igor/retry-policy-service)
+
 There are two strategies
 - constant - constant delay between retries
 - exponential - Exponential backoff is a strategy in which you increase the delays between retries