chore: commit common elements of macOS bundle

everything except the executable, essentially

.gitignore

@@ -1,2 +1,2 @@
 bin/
-macos/bookmarkd.app/
+macos/bookmarkd.app/MacOS/

macos/bookmarkd.app/Contents/Info.plist

@@ -0,0 +1,30 @@
+<?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>CFBundleGetInfoString</key>
+  <string>bookmarkd</string>
+  <key>CFBundleExecutable</key>
+  <string>bookmarkd</string>
+  <key>CFBundleIdentifier</key>
+  <string>com.example.www</string>
+  <key>CFBundleName</key>
+  <string>bookmarkd</string>
+  <key>CFBundleIconFile</key>
+  <string>icon.icns</string>
+  <key>CFBundleShortVersionString</key>
+  <string>0.01</string>
+  <key>CFBundleInfoDictionaryVersion</key>
+  <string>6.0</string>
+  <key>CFBundlePackageType</key>
+  <string>APPL</string>
+  <key>IFMajorVersion</key>
+  <integer>0</integer>
+  <key>IFMinorVersion</key>
+  <integer>1</integer>
+  <key>NSHighResolutionCapable</key><true/>
+  <key>NSSupportsAutomaticGraphicsSwitching</key><true/>
+  <key>LSUIElement</key>
+  <true/>
+</dict>
+</plist>