show download button if geode not installed

app/src/main/res/drawable/icon_download.xml

@@ -0,0 +1,11 @@
+<!-- Using the download icon from Google's Material Icons. -->
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="960"
+    android:viewportHeight="960"
+    android:tint="?attr/colorControlNormal">
+  <path
+      android:fillColor="@android:color/white"
+      android:pathData="M480,640L280,440L336,382L440,486L440,160L520,160L520,486L624,382L680,440L480,640ZM240,800Q207,800 183.5,776.5Q160,753 160,720L160,600L240,600L240,720Q240,720 240,720Q240,720 240,720L720,720Q720,720 720,720Q720,720 720,720L720,600L800,600L800,720Q800,753 776.5,776.5Q753,800 720,800L240,800Z"/>
+</vector>

app/src/main/res/values/strings.xml

@@ -6,11 +6,13 @@
     <string name="game_not_found">Geometry Dash was not found.</string>
     <string name="launcher_launch">Launch</string>
     <string name="launcher_settings">Settings</string>
+    <string name="launcher_download">Download</string>
     <string name="launcher_title">Geode</string>
     <string name="launcher_logo_alt">geode logo</string>
     <string name="launcher_launch_icon_alt">play icon</string>
+    <string name="launcher_download_icon_alt">download icon</string>
     <string name="launcher_settings_icon_alt">settings icon</string>
-    <string name="geode_download_title">Geode is not installed</string>
+    <string name="geode_download_title">Geode is not installed.</string>
     <string name="geode_download_description">Geode is downloading. Please wait.</string>
     <plurals name="automatically_load_countdown">
         <item quantity="one">Automatically launching game in %1$d second.</item>