Add definitions for reactcss (#12122)

* Add definitions for react-css-transition-replace

* Add definitions for reactcss

* Change test header

* Remove accidentally added other definitions

* Remove yarn.lock from .gitignore

reactcss/reactcss-tests.tsx

@@ -0,0 +1,29 @@
+// ReactCSS Test
+// ================================================================================
+///<reference path="reactcss.d.ts"/>
+///<reference path="../react/react.d.ts"/>
+///<reference path="../react/react-dom.d.ts"/>
+
+// Imports
+// --------------------------------------------------------------------------------
+import * as React from "react"
+import { StatelessComponent } from "react"
+import { render } from "react-dom"
+import { default as reactCSS, hover, loop } from "reactcss"
+
+interface TestProps extends ReactCSS.HoverProps {}
+
+var styles: any = reactCSS({
+    default : {},
+    hover   : {}
+}, { hover : true })
+
+var loopProps: ReactCSS.LoopableProps = loop(1, 10)
+
+var TestComponent: StatelessComponent<TestProps>
+var Test = hover(TestComponent)
+
+render(
+    <Test />,
+    document.getElementById("main")
+)