Update README.md

Author: sheetalkamat

README.md

@@ -9,28 +9,24 @@ Latest version of the grammar can be also found as a [VSCode extension](https://
 
 The XML files are generated from the YAML files, so contributors should hand-modify the YAML files, and XML files should only be generated by running build script.
 
+## Install dependencies
+``` sh
+npm install
+```
+
 ## Build
 
-Update the XML files from within the ```build``` folder
+Compile the yaml file into the tmLanguage and tmTheme files
 
 ``` sh
-cd build
-npm install         # Installs dependencies required for building
-npm start           # Compiles & builds the XML files
+npm run build:grammar
 ```
 
 ## Tests
 
-Test are run from within the ```tests``` folder and depend on build to make sure XML files are upto date
-
 ``` sh
-cd build
-npm install         # Installs dependencies required for building
-
-cd ../tests
-npm install         # Installs dependencies required for testing
 npm test            # Compiles & runs tests
 
 npm run diff        # Diffs the test baselines with generated one using tool set in environment variable DIFF
 npm run accept      # Accepts the test baselines
-```
+```