Update README and test customizing path

Author: Thomas-Boi

README.md

@@ -1,2 +1,19 @@
 # heroku-playwright-chromium
-A buildpack to install the Chromium exe and its dependencies for us with playwright.
+A buildpack to install the Playwright Chromium executable ONLY. 
+
+
+# Usage
+
+1. Add this buildpack to your app alongside the [heroku-playwright-buildpack](https://github.com/playwright-community/heroku-playwright-buildpack).
+  - The script CANNOT install the system requirements due to restrictions from Heroku. It's only able to install the Chromium exe. 
+  - Thus, we rely on [heroku-playwright-buildpack](https://github.com/playwright-community/heroku-playwright-buildpack) to get the other packages.
+2. Run and deploy
+
+# Customization
+By default, this will install the necessary exe into a folder called `/browsers` under the build directory (the directory where the root script lives).
+
+# Notes
+This was developed for usage with `playwright-python` in mind so support for other languages is unknown.
+
+
+

bin/compile

@@ -6,6 +6,10 @@ set -e
 BUILD_DIR=$1
 
 # modify the installation location
+if [ -z "$INSTALL_PATH" ]; then
+  INSTALL_PATH="/browsers"
+fi
+
+echo "Install path is $INSTALL_PATH"
 export PLAYWRIGHT_BROWSERS_PATH=$BUILD_DIR/browsers
-# playwright install --with-deps chromium
 playwright install chromium