Add load testing readme

load-test/README.md

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+# Load Testing
+
+We're using [Locust.io](https://locust.io/) for our load tests. The tests can be run locally or in a VM.
+
+## Available Option (Env Vars)
+
+`TARGET_URL` - The host address that locust should load test against
+* If you're running the app locally http://docker.for.mac.localhost:8000
+  * This is for running on a mac, you may need to use other methods to get the container to communicate with localhost on other systems
+* Staging - https://staging.atat.code.mil
+* Prod - https://azure.atat.code.mil
+
+`DISABLE_VERIFY` - False by default, set to true to prevent SSL verification
+
+`ATAT_BA_USERNAME` + `ATAT_BA_PASSWORD` - Username and password for the basic auth on the staging and production sites
+
+## To Run Locally
+1. Build the docker container:
+
+    `docker build . -t pwatat.azurecr.io/loadtest/locust`
+2. Run the container:
+
+    `
+    docker run --rm -p 8089:8089 \
+    -e TARGET_URL=https://staging.atat.code.mil \
+    -e DISABLE_VERIFY=false \
+    -e ATAT_BA_USERNAME=<username> \
+    -e ATAT_BA_PASSWORD=<password> \
+    --name locust pwatat.azurecr.io/loadtest/locust:latest
+    `
+
+## To Update Image
+1. Build the docker container:
+
+    `docker build . -t pwatat.azurecr.io/loadtest/locust`
+2. Push to our container registry
+
+    `docker push pwatat.azurecr.io/loadtest/locust`
+
+   * If you get an authorization failed message, you may need to re-authorize with this command first:
+
+        `az acr login --name pwatat`
+3. Restart the `atat-load-test` app service in the azure portal
+   * Note the load test service is running on a free tier VM, so it will likely be paused. Start it up and press restart to referesh before beginning your load testing.