Update README.md

README.md

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-# docker-locust
+# Dockerized Locust
+A dockerized locust workload generator.
+The locustfile.py is downloaded at startup from the configured URL. This allows this docker image to be used in different scenarios without having to rebuild it.
+
+## Usage
+The following environment variables have to be set:
+* `LOCUST_MODE`: `master`, `slave` or `standalone`
+* `LOCUST_FILE_URL`: URL of the locustfile that will be downloaded at startup
+* `TARGET_URL`: URL of the target system (e.g., http://edge:8080)
+* `INFLUXDB_URL`: URL of InfluxDB to write workload statistics
+* `INFLUXDB_PORT`: Port of InfluxDB (default: 8086)