Adding load test info to the README.

README.md

@@ -50,4 +50,28 @@ Delete the store:
 
 ```
 curl -X DELETE http://localhost:9200/_plugins/ubi/awesome
-```
+```
+
+## Load Test
+
+The `load-test` directory contains a basic load testing example. The purpose of the files under `load-test` are to provide a means of testing the plugin's ability to receive and store a large number of events over time. To use the load test, first start OpenSearch on `localhost:9200`, and then:
+
+```
+cd load-test
+source ./venv/bin/activate
+./run.sh
+```
+
+The test will run for 10 seconds. The number of events sent will be shown along with the `_count` of events in the store:
+
+```
+Type     Name                                                                          # reqs      # fails |    Avg     Min     Max    Med |   req/s  failures/s
+--------|----------------------------------------------------------------------------|-------|-------------|-------|-------|-------|-------|--------|-----------
+POST     /_plugins/ubi/mystore                                                              8     0(0.00%) |      8       6       9      8 |    0.81        0.00
+--------|----------------------------------------------------------------------------|-------|-------------|-------|-------|-------|-------|--------|-----------
+         Aggregated                                                                         8     0(0.00%) |      8       6       9      8 |    0.81        0.00
+
+Found 8 indexed
+```
+
+This shows 8 total requests made by locust, and 8 events are in the index. The idea being we can assert that the number of events sent matches the events stored in the index.