Merge pull request spinframework#200 from ThorstenHans/feature/js-kv-example

Add key-value sample for JavaScript

Author: karthik2804

examples/javascript/kv/.gitignore

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+node_modules
+dist
+target
+.spin/

examples/javascript/kv/README.md

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+# `spin-js-sdk` key-value sample
+
+This app demonstrates how to use key-value store APIs with the Spin JavaScript SDK (`spin-js-sdk`).
+
+The app exposes several endpoints using an HTTP trigger:
+
+- `GET /`: Retrieve all keys and values from the store
+- `GET /json/:key`: Retrieve a JSON value from the store using its key
+- `SET /json/:key`: Stores the entire request payload as JSON for the given key
+- `GET /:key`: Retrieve a plain value from the store using its key
+- `SET /:key`: Stores the `value` property of the payload as plain text in key-value store
+- `DELETE /:key`: Removes a value from the key-value store by its key
+
+The app leverages the `default` key-value store as specified in `spin.toml`.
+
+## Build and run the app locally
+
+To build and run the app locally, you can either use `spin build` and `spin up` or combine both commands and simply run `spin build --up`.