Create README.md

Author: thesebas

README.md

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+# php-promise-async-await
+ReactPHP async-await emulator with generator and yield
+
+
+## Instalation
+
+    composer require thesebas/promise-async-await
+    
+## Usage
+It makes possible writing
+
+    asyncRun(function ($init) {
+        $res = yield asyncFunc($init);
+        $res2 = yield all([asyncFunc($res+1), asyncFunc($res+1)]);
+        $res3 = yield race([asyncFunc($res*2), asyncFunc($res2/2)]);
+        return "wow".$init.$res.$res2.$res3;
+    }, 0.1)->then(function($result){
+        // ... $result is eq "wow".$res.$res2.$res3;
+    });
+    
+instead of
+
+    asyncFunc($init)->then(function($res){
+        return all([asyncFunc($res+1), asyncFunc($res+1)]);
+    })->then(function($res2){
+        return yield race([asyncFunc(/* $res ?? */), asyncFunc($res2/2)]);
+    })->then(function($res3){
+        return "wow"./* $init ?? */ /* $res ??*/ /* $res2 ??*/ $res3
+    })->then(function($result){
+        // $result is eq "wow".$res3
+    })
+    
+For more see `spec`