Add api for getSize

Author: negative0

src/endpoint.js

@@ -131,5 +131,10 @@ const urls = {
      * Transferred jobs for rclone.
      */
     transferred: 'core/transferred',
+
+    /**
+     * getSize of a fs
+     */
+    getSize: 'operations/size'
 };
 export default urls;

src/index.js

@@ -394,3 +394,16 @@ export const coreCommand = ( arg, opt) => {
 		})
 	})
 }
+
+export const getSize = (srcFs, srcRemote) => {
+	let data = {
+		fs: `${srcFs}${srcRemote ? srcRemote : ''}`
+	};
+	return new Promise((resolve, reject) => {
+		axiosInstance.post(urls.getSize, data).then(res => {
+			resolve(res.data);
+		}, error => {
+			reject(error);
+		})
+	})
+}