docs: update README.md. Include e2e command usage

README.md

@@ -3,37 +3,65 @@
 Node.js library to interact with the StApps backend service
 
 ## Use this as a standalone program
+
 To get some data into a local `backend-node`-instance, you can run this
 as a standalone program to copy data of a remote `backend-node`-instance
 into your local one.
 
 Example to copy all Events of the b-tu instance:
+
 ```shell
 npm install
 npm run build
 node ./lib/cli.js copy Event https://stappsbe01.innocampus.tu-berlin.de http://localhost:3000 100
 ```
 
-### Program arguments:
+Example to index all items from @openstapps/core test files to a backend:
+
+```shell
+npm install
+npm run build
+node ./lib/cli.js e2e http://localhost:3000
+```
+
+### Program arguments
 
 ```shell
 node ./lib/cli.js copy <type> <from> <to> <batchSize>
+
+node ./lib/cli.js e2e <to>
 ```
 
-#### Options:
+#### Options
+
+The source identifier for the bulk to use with the target instance (default is 'copy')
+
 ```shell
 -s, --bulkSource <bulkScource>
 ```
-The source identifier for the bulk to use with the target instance (default is 'copy')
+
+The App version to use (unset by default)
 
 ```shell
 -a, --appVersion <version>
 ```
-The App version to use (unset by default)
+
+The only available option for `e2e` command. File path to json test files each containing a SCThing.
+
+```shell
+-s, --samples <path>
+```
 
 ### Example execution
+
 with docker when backend is running on `localhost:3000`:
 
 ```shell
 docker run --net=host registry.gitlab.com/openstapps/api/copy copy Place https://stappsbe01.innocampus.tu-berlin.de http://localhost:3000 100
 ```
+
+Or using `e2e` command:
+
+```shell
+docker run --net=host registry.gitlab.com/openstapps/api/copy e2e http://localhost:3000
+```