[doc] Added documentation about build environment and linters

README.md

@@ -50,8 +50,29 @@ Doing so, the minimal working versions of node.js and npm are:
 * `node --version`: `v8.10.0`
 * `npm --version`: `3.5.2`
 
+## Access to build environment
+
+The build environment can be invoked using the `cmd` script at the repository's root by passing the wanted command as a parameter to it.
+The sources repository is mapped to the `/src` folder in the build environment.
+For example, to execute the `build-src.sh` script in the context of the specified build environment (instead of the local host):
+
+```sh
+./cmd /src/build-src.sh
+```
+
+The `cmd` script tries to lookup the current folder relative to the repository's root in order to execute the requested command within the same folder.
+It is then possible to execute:
+
+```sh
+cd extension
+../cmd npm install
+```
+
 ## Run linters
 
+Linters for the components are called during the normal process.
+It is also possible to manually invoke the configured linter as follow:
+
 ```sh
 cd extension
 ../cmd run linter