docs: Add a short readme to tests directory

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+# Loader Tests
+
+This directory contains a test suite for the Vulkan loader.
+These tests are not exhaustive — they are expected to be supplemented with other tests, such as CTS.
+
+## Running Tests
+
+To run the tests, your environment needs to be configured so that the test layers will be found.
+This can be done by setting the `VK_LAYER_PATH` environment variable to point at the built layers.
+Depending on the platform build tool you use, this location will either be `${CMAKE_BINARY_DIR}/tests/layers` or `${CMAKE_BINARY_DIR}/tests/layers/${CONFIGURATION}`.
+When using Visual Studio, a the generated project will already be set up to set the environment as needed.
+Running the tests through the `run_loader_tests.sh` script on Linux will also set up the environment properly.
+With any other toolchain, the user will have to set up the environment manually.