Add documentation for CYPRESS_DIR env var to readme and include CYPRESS_DIR inspect to config class

Author: dmanliclic715

README.md

@@ -156,6 +156,7 @@ preferred environment variables project-wide using a tool like
 
 
 * **CYPRESS_RAILS_DIR** (default: `Dir.pwd`) the directory of your project
+* **CYPRESS_DIR** (default: `Dir.pwd`) the directory of your Cypress project
 * **CYPRESS_RAILS_HOST** (default: `"127.0.0.1"`) the hostname to bind to
 * **CYPRESS_RAILS_PORT** (default: _a random available port_) the port to run
   the Rails test server on

lib/cypress-rails/config.rb

@@ -28,6 +28,7 @@ def to_s
         cypress-rails configuration:
         ============================
          CYPRESS_RAILS_DIR.....................#{dir.inspect}
+         CYPRESS_DIR...........................#{cy_dir.inspect}
          CYPRESS_RAILS_HOST....................#{host.inspect}
          CYPRESS_RAILS_PORT....................#{port.inspect}
          CYPRESS_RAILS_BASE_PATH...............#{base_path.inspect}