tests: add bats tests for testing CLI on arbitrary Boundary deployments (#614)

internal/tests/cli/README.md

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+# Boundary CLI Tests
+
+This directory contains [bats tests](https://github.com/bats-core/bats-core) for testing the Boundary CLI against arbitrary Boundary deployments. 
+The tests are meant to mimic common workflows such as creating resources, and connecting to targets. Currently, the tests rely heavily on
+generated resources when running Boundary in `dev` mode. In the future, we hope to remove this dependency and generate all resources through
+the Boundary CLI from the outset. 
+
+The tests are designed to be idempotent.
+
+## Getting Started
+
+#### Dependencies
+
+- [jq](https://stedolan.github.io/jq/)
+- [bats](https://github.com/bats-core/bats-core)
+- [boundary](https://github.com/hashicorp/boundary)
+
+#### Running Tests
+
+1. Start boundary in dev mode
+
+```bash
+boundary dev
+```
+
+or direct the tests towards an existing install by setting
+
+```bash
+export BOUNDARY_ADDR=<your_install>
+```
+
+2. Run the tests
+
+```bash
+bats -p boundary/
+```