Add docs

scripts/README.md

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+# Generate New Spreadsheet Layer
+
+This directory contains scripts and logic for manual as well as automated generation of new spreadsheet based layers.
+
+## Steps to manually generate layer
+
+1. Create `input.json`
+   ```sh
+   cp sample.input.json
+   ```
+
+2. Replace values in `input.json` with the data for new spreadsheet layer
+3. Execute `manualGenLayer.js`
+   ```sh
+   node manualGenLayer.js
+   ```
+4. Check if json files are modified inside `src/`
+5. Build the entire package
+   ```sh
+   grunt build
+   ```
+6. Modify example files and check if you can use the newly generated layer
+   ```sh
+   npm start
+   ```
+7. Commit Files and Create Pull Request
+
+
+## Automatically Generate Layer
+
+// To be added in follow up PR