chore(test): readme for e2e-test (#2316)

Signed-off-by: nidhi-singh02 <trippin@berachain.com>
Signed-off-by: Cal Bera <calbera@berachain.com>
Co-authored-by: Cal Bera <calbera@berachain.com>

testing/e2e/README.md

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+# Running BeaconKit with Kurtosis for testing
+
+## What is Kurtosis
+
+[Kurtosis](https://www.kurtosis.com/) is a platform for running distributed
+systems on Docker / Kubernetes. It provides a simple, powerful framework for
+spinning up and tearing down distributed systems programmatically.
+
+## How to Use
+
+To use BeaconKit with Kurtosis, you'll first need to install the Kurtosis CLI
+and its dependencies. You can find instructions for doing so
+[here](https://docs.kurtosis.com/install).
+
+### Docker/Test environment
+
+Once you've installed the Kurtosis CLI, you can use it to spin up a Beacon
+network with the following command from within the root directory of the
+beacon-kit repo:
+
+```bash
+make test-e2e
+```
+If required, add tests under testing/e2e folder.
+
+This will automatically build your beacond docker image from the local source
+code, and spin up a Kurtosis network based on the config file in
+`testing/e2e/config/defaults.go`.
+
+## Configuration
+In case you want to configure(change) the validator set, consider doing changes in `defaultValidators`.
+The user can specify the number of replicas they want per type.
+
+All the default configuration are listed in `testing/e2e/config/defaults.go`
+
+Note: Currently the chainID for this local network is 80087, which is our dev network configuration (this is fixed in the kurtosis env setup and will be made configurable in a future version). To make changes to the 80087 chain spec used, modify parameters [here](https://github.com/berachain/beacon-kit/blob/main/config/spec/devnet.go#L40).
+
+## Add your tests
+Add your tests in here like how it is done in `TestBasicStartup()`
+
+