Update README.md

Author: phiresky

README.md

@@ -115,6 +115,7 @@ Then, go to a new directory and add a few dependencies:
 ```sh
 mkdir example
 cd example
+echo '{}' > package.json
 npm install --save-dev webpack webpack-cli typescript ts-loader http-server
 npm install --save sql.js-httpvfs
 npx tsc --init
@@ -157,4 +158,4 @@ And you should see the output to the query `select * from mytable`.
 [{"foo":"hello","bar":"world"}]
 ```
 
-The full code of this example is in [example/](./example/).
+The full code of this example is in [example/](./example/).