docs: improve testing docs (#133)

testing/setup_env.sh

@@ -1,4 +1,5 @@
 #!/bin/bash
+# To run: ./setup_env.sh
 
 command_exists() {
     command -v "$1" >/dev/null 2>&1
@@ -45,4 +46,5 @@ echo "Installing the requirements from ${REQUIREMENTS_FILE}..."
 pip install -r $REQUIREMENTS_FILE --index-url https://pypi.org/simple
 conda activate $ENV_NAME
 
-echo "Setup complete."
+echo "Setup complete."
+echo "Run 'conda activate $ENV_NAME' to activate the environment."