add readme

Author: Piotr Stachyra

test/load/README.md

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+# Load tests
+
+The document describes how to run load tests against https://metadata.cardano-testnet.iohkdev.io/.
+It is recommended to perform a load run before every release to gather results and make sure there is no performance deterioration or any unexpected behavior.
+
+Performance tests are completed with locust.io, written in Python, and performed from a test engineers home computer. The users are ramped up at a rate of 10 per second until they hit the target Total Users. This is maintained for several minutes and results are then aggregated from across the entire run.
+
+## To run the test
+
+1. Start locust docker
+```
+$ cd test/load
+$ make
+```
+
+2. Visit http://0.0.0.0:8089/ and run test from there.
+
+## Pre-relese test
+
+Total Users = 1000
+Ramp up rate = 10
+
+Execution time = 10 minutes from the point where all users ramp up.
+
+Store results in https://github.com/input-output-hk/offchain-metadata-tools/wiki/Load-Tests-Results