add gitignore and README.md

.gitignore

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+.idea/

README.md

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+# react-state-utils
+manage state global reactjs project
+
+# ConnectGlobalState
+Usage
+  - Connect Component to state global
+  ```sh
+      class App extends Component {
+        render() {
+            return (
+                <div>
+                    <h3>App Component</h3>
+                </div>
+            );
+        }
+    }
+
+    export default connectGlobalState(App);
+  ```
+  - Set state global ```this.setGlobalState({ [stateName]:[stateValue] })```
+  ```sh
+   this.setGlobalState({name:'Bob'})
+  ```
+  - Get state global ```this.globalState.[stateName]```
+  ```sh
+  this.globalState.name //Bob
+  ```