App bundle almost working... + add icon, readme

.gitignore

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+.DS_Store

readme.md

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+# VidGrid
+
+## TODO
+
+- it works when you run it from the terminal (`open VidGrid.app`), but it doesn't work when you double-click...
+    - would it help if we popped up a terminal window?
+    - see https://relentlesscoding.com/posts/create-macos-app-bundle-from-script/
+- fix hardcoded screen resolution

vidgrid.app/Contents/Info.plist

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+  <key>CFBundleName</key>
+  <string>VidGrid</string>
+  <key>CFBundleExecutable</key>
+  <string>VidGrid</string>
+  <key>CFBundleIdentifier</key>
+  <string>com.nloewen.vidgrid</string>
+  <key>CFBundleIconFile</key>
+  <string>512-apps-vidgrid.png</string>
+</dict>
+</plist>