Create README.md

Author: esdraelon

README.md

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+### Amtgard PHPUnit Extensions
+
+Adds `self::assertThrows(string $throwableClass, callable $callable)` and `self::assertDoesNotThrow(callable $callable)` assertions.
+
+#### assertThrows()
+Takes a throwable classname. The callable must throw the exception and the exception class must match.
+
+#### assertDoesNotThrow()
+The callable must not throw.