feat: Introduces an idx folder containing an IDX template, enabling users to open Android tutorials directly in the IDX IDE.

idx/open-in-idx-template/README.md

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+## Open in Project IDX 
+
+## How to use the template
+
+This template allows opening Google Maps Platform Android tutorial code samples in IDX IDE. To open a code sample in IDX, go to `https://idx.google.com/new?template=https://github.com/googlemaps-samples/android-samples/idx/open-in-idx-template` and provide the gitUrl, subdir and the name of the activity to launch as query params. 
+
+```
+https://idx.google.com/new
+?template=https://github.com/googlemaps-samples/android-samples/idx/open-in-idx-template 
+&giturl=https://github.com/googlemaps-samples/android-samples
+&subdir=tutorials/java/CurrentPlaceDetailsOnMap/
+&launchactivity=com.example.currentplacedetailsonmap/.MapsActivityCurrentPlace
+&apikey=AIXXXXXXXXXXXXXXsg
+```
+
+Please review the template parameters in idx-template.json file. If a parameter is not provided in the link as a query param, the default value specified in the `idx-template.json` file will be used. If the parameter doesn't specify a default value and a value is not provided as a query param, the IDX workspace creation dialog asks for the value.
+
+There is no default value for the API Key. You must provide it as a query parameter or alternatively in the IDX workspace creation dialog.
+
+The example below demonstates how you could open a code sample in IDX. The link in the example will open the code sample specified by the default values in idx-template.json and you'd be asked to provide an API Key on IDX workspace creation dialog.
+
+<a href="https://idx.google.com/new?template=https://github.com/googlemaps-samples/android-samples/idx/open-in-idx-template&giturl=https://github.com/googlemaps-samples/android-samples&subdir=tutorials/java/CurrentPlaceDetailsOnMap/&launchactivity=com.example.currentplacedetailsonmap/.MapsActivityCurrentPlace">
+  <img
+    alt="Open in IDX"
+    src="https://www.gstatic.com/monospace/230815/openinprojectidx.png"
+    width="170"
+  />
+</a>

idx/open-in-idx-template/devNix.j2

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+# To learn more about how to use Nix to configure your environment
+# see: https://developers.google.com/idx/guides/customize-idx-env
+{ pkgs, ... }: {
+  # Which nixpkgs channel to use.
+  channel = "stable-23.11"; # or "unstable"
+  # Use https://search.nixos.org/packages to find packages
+  packages = [
+    pkgs.jdk21
+  ];
+  # Sets environment variables in the workspace
+  env = {};
+  idx = {
+    workspace = {
+      onCreate = {
+        build-and-wait = "./gradlew assembleDebug && adb -s emulator-5554 wait-for-device";
+        default.openFiles = [ "README.md" ];
+      };
+      onStart = {
+        wait-for-adb = "adb -s emulator-5554 wait-for-device";
+      };
+    };
+    previews = {
+      enable = true;
+      previews = [
+        {
+          command = ["./gradlew" "--continuous" "installDebug"];
+          id = "android";
+          manager = "gradle";
+          activity = "{{ launch_activity }}";
+        }
+      ];
+    };
+  };
+}

idx/open-in-idx-template/idx-template.json

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+{
+    "name": "Open in IDX for Maps SDK for Android Samples",
+    "description": "This template allows opening Android tutorials in IDX IDE",
+    "categories": ["Backend"],
+    "icon": "https://developers.google.com/static/maps/images/maps-icon.svg",
+    "publisher": "Google LLC",
+    "params": [
+      {
+        "id": "apikey",
+        "name": "API KEY",
+        "type": "text"
+      },
+      {
+        "id": "giturl",
+        "name": "Git Url",
+        "type": "text",
+        "default": "https://github.com/googlemaps-samples/android-samples"
+      },
+      {
+        "id": "subdir",
+        "name": "Project Subfolder",
+        "type": "text",
+        "default": "tutorials/java/MapWithMarker/"
+      },
+      {
+        "id": "launchactivity",
+        "name": "Android Activity to launch",
+        "type": "text",
+        "default": "com.example.mapwithmarker/.MapsMarkerActivity"
+      }
+    ],
+    "host": {
+      "virtualization": "true"
+   }
+  }  

idx/open-in-idx-template/idx-template.nix

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+{ pkgs, apikey, giturl, subdir, launchactivity,... }: {
+  packages = [
+      pkgs.git
+      pkgs.sdkmanager
+      pkgs.j2cli
+  ];
+  bootstrap = ''
+    mkdir -p "$WS_NAME" tmp
+
+    git clone --depth 1 ${giturl} tmp
+
+    mv tmp/${subdir}/* "$WS_NAME"
+
+    chmod -R +w "$WS_NAME"
+    mkdir -p "$WS_NAME/.idx/"
+
+    # Create a secrets.properties file in the repo and replace the MAPS_API_KEY property with said value
+    touch $WS_NAME/secrets.properties
+    echo "MAPS_API_KEY=\"${apikey}\"" > $WS_NAME/secrets.properties
+
+    # We create a dev.nix that builds the subproject specified at template instantiation
+    launch_activity=${launchactivity} j2 --format=env ${./devNix.j2} -o $WS_NAME/.idx/dev.nix
+
+    mv "$WS_NAME" "$out"
+  '';
+}