ADD readme content

Author: Andreas Günther

README.md

@@ -1,3 +1,38 @@
 # SwiftAsyncAssert
 
-XCTAssert variants to evaluate async expressions in XCTests.
+Assert functions to evaluate Swift concurrency async expressions in XCTests.
+
+> The Missing concurrency functions in `XCTest` framework
+
+---
+
+Instead of writing 
+
+```swift
+import XCTest
+
+func test_should_succeed() async
+    do {
+        let isTrue = try await shouldSucceed()
+        XCTAssertTrue(isTrue)
+    } catch {
+        XCFail("Should not throw an error")
+    }
+}
+```
+
+conveniently write
+
+```swift
+import SwiftAsyncAssert
+
+func test_should_succeed() async 
+    await AsyncAssertTrue(try await shouldSucceed())
+}
+
+func test_should_throwError() async 
+    await AsyncAssertThrowsError(try await shouldFail())
+}
+```
+
+Less code for your convenience when testing!