add geolocation weather example

samples/geolocation-weather/.gitignore

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+node_modules
+dist
+target
+.spin/
+build/
+.spin-aka/

samples/geolocation-weather/.npmrc

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+KNITWIT_SOURCE=./config/knitwit.json

samples/geolocation-weather/README.md

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+# Geolocation Weather Application
+
+This sample illustrates how to fetch weather data from an API based on the user's geolocation data. Behind the scenes, ip-api.com is used to look up the latitude, longitude coordinates using the client's IP address and aqicn.org is used to fetch weather data.
+
+## Prerequisites
+
+- Spin CLI
+- Spin `aka` plugin
+- WAQI API token from [https://aqicn.org/api/](https://aqicn.org/api/)
+
+## Deploy to FWF
+
+Once you've cloned the repository and moved to the ./samples/geolocation-weather, install the dependencies, build and run the app:
+
+```console
+spin build
+spin aka deploy --variable waqi_api_token=<your_api_token_here>
+```
+
+The `spin aka deploy` command will print the application URL to `stdout`.
+
+Use the browser to see application running at the address printed.
+
+## Running locally
+
+When testing locally, this sample will use a default IP address instead of 127.0.0.1 for the client IP address which can be overriden for test purposes on the CLI.
+
+```console
+spin build
+SPIN_VARIABLE_WAQI_API_TOKEN=<your_api_token_here> spin up
+```
+
+To test with a specific client ip address:
+
+```console
+SPIN_VARIABLE_TEST_IP_ADDR=<client_ip_here> \
+SPIN_VARIABLE_WAQI_API_TOKEN=<your_api_token_here> spin up
+```

samples/geolocation-weather/config/knitwit.json

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+{
+  "version": 1,
+  "project": {
+    "worlds": [
+      "spin-http"
+    ]
+  },
+  "packages": {
+    "@fermyon/spin-sdk": {
+      "witPath": "../../bin/wit",
+      "world": "spin-imports"
+    }
+  }
+}