add shields.io badges to Readme

Author: angu-software

README.md

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 # SwiftAsyncAssert
 
+![platforms](https://img.shields.io/badge/macOS_10.15%7CiOS_13%7CwatchOS_6%7CtvOS_13-orange?logo=swift&label=platforms&labelColor=white&color=%23F05138)<br/>
+![version](https://img.shields.io/github/v/release/angu-software/SwiftAsyncAssert?label=Version&labelColor=white&color=%23F05138)
+![build status](https://img.shields.io/github/actions/workflow/status/angu-software/SwiftAsyncAssert/swift.yml?logo=githubactions&labelColor=white&label=Build)
+
 Assert functions to evaluate Swift concurrency async expressions in XCTests.
 
 > The Missing concurrency functions in `XCTest` framework