feat(examples): make get-weather-js work without an API key (microsoft#294)

Author: bowlofarugula

examples/get-open-meteo-weather-js/.gitignore

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+node_modules
+dist
+*.wasm
+pnpm-lock.yaml
+out-dir

examples/get-open-meteo-weather-js/Justfile

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+build:
+    npm install 
+    npm run build:component

examples/get-open-meteo-weather-js/README.md

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+# Get Weather Example (JavaScript)
+
+This example demonstrates how to get the weather for a given location using a Wassette component written in JavaScript.
+
+For more information on installing Wassette, please see the [installation instructions](https://github.com/microsoft/wassette?tab=readme-ov-file#installation).
+
+## Usage
+
+This component uses the [Open-Meteo API](https://open-meteo.com/), which provides free weather data without requiring authentication.
+
+Load the component from the OCI registry and provide a city name.
+
+**Load the component:**
+
+```
+Please load the component from oci://ghcr.io/microsoft/get-weather-js:latest
+```
+
+**Get the weather:**
+
+```
+get the weather for Toronto
+```
+
+## Policy
+
+By default, WebAssembly (Wasm) components do not have any access to the host machine or network. The `policy.yaml` file is used to explicitly define what network resources and environment variables are made available to the component. This ensures that the component can only access the resources that are explicitly allowed.
+
+Example:
+
+```yaml
+version: "1.0"
+description: "Permission policy for wassette weather demo"
+permissions:
+  network:
+    allow:
+      - host: "geocoding-api.open-meteo.com"  # For geocoding city names to coordinates
+      - host: "api.open-meteo.com"            # For fetching weather data
+```
+
+The source code for this example can be found in [`weather.js`](weather.js).