add: Deploy to ICP Ninja + standardize README (#1184)

Author: jessiemongeon1

motoko/query_stats/README.md

@@ -0,0 +1,23 @@
+# Query stats
+
+## Deploying from ICP Ninja
+
+[![](https://icp.ninja/assets/open.svg)](https://icp.ninja/editor?g=https://github.com/dfinity/examples/tree/master/motoko/query_stats)
+
+## Build and deploy from the command-line
+
+### 1. [Download and install the IC SDK.](https://internetcomputer.org/docs/building-apps/getting-started/install)
+
+### 2. Download your project from ICP Ninja using the 'Download files' button on the upper left corner, or [clone the GitHub examples repository.](https://github.com/dfinity/examples/)
+
+### 3. Navigate into the project's directory.
+
+### 4. Deploy the project to your local environment:
+
+```
+dfx start --background --clean && dfx deploy
+```
+
+## Security considerations and best practices
+
+If you base your application on this example, it is recommended that you familiarize yourself with and adhere to the [security best practices](https://internetcomputer.org/docs/building-apps/security/overview) for developing on ICP. This example may not implement all the best practices.