Update README.md

README.md

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-# ranchimalldapps
- 
+# All in one place to securely access FLO blockchain-based DApps from RanchiMall
+
+## How does integrity check work?
+There are two parts to how the integrity check works.
+- Server-side hash calculation
+  * Hash generated for hosted app code. Which uses ```hash``` endpoint from ```https://utility-api.ranchimall.net/``` API.
+  * Hash generated from Github repo API.
+- Authorized app hashes stored inside ```scripts/dappList.js``` file within this repo.
+Both of these hashes need to match to pass the integrity checks.
+
+## How to update the hashes
+- Server-side hashes
+  * These are updated automatically when the content of any RanchiMall repo changes and uses ***Github webhooks***
+- Local hashes
+  * To update locally stored hashes you can use `scripts/updateAuthorizedHashes.js` node script.
+  ```Javascript
+  // To run the updateAuthorizedHashes.js
+  // Navigate to scripts folder within dapps repo
+  // and run following command in the console
+  node updateAuthorizedHashes.js
+  //you will require node to installed to run this command
+  ```
+  * This might take a few minutes. If there is no error, you should get `Updated dappList.js` message in the console.
+  * ***Please don't run this command repeatedly as it will encounter Github API rate limit***