Add README

Author: tompntn

integration-tests/README.md

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+# Pyth Agent End-To-End Integration Tests
+
+This project provides end-to-end tests for the [Pyth `agent`](../) binary. Each test:
+- Starts an instance of [`solana-test-validator`](https://docs.solana.com/developing/test-validator).
+- Deploys the [Pyth Oracle program](https://github.com/pyth-network/pyth-client/tree/main/program).
+- Creates [Mapping; Product and Price accounts](https://docs.pyth.network/design-overview/account-structure) using the [`program-admin`](https://github.com/pyth-network/program-admin) library.
+- Builds and runs an instance of Pyth `agent`, configured with the accounts set up in the previous step.
+- Uses the [JRPC Websocket API](https://docs.pyth.network/publish-data/pyth-client-websocket-api) to test publishing and retrieving data from the network.
+
+## Installing
+The test framework uses [Poetry](https://python-poetry.org/) and requires Python >3.10. To install the project:
+
+```bash
+poetry install
+```
+
+## Running Tests
+```bash
+pytest -s --log-cli-level=debug
+```