[POC] KLIP-15-based JavaScript client and example app

ksql-js-client/.gitignore

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+**/.cache/
+**/dist/
+**/lib/

ksql-js-client/.mocharc.js

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+module.exports = {
+  extension: ["ts"],
+  require: "ts-node/register"
+};

ksql-js-client/README.md

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+# ksqlDB-js-client
+
+| :warning:	Proof of concept |
+| -------------------------- |
+| This directory provides a sample ksqlDB JavaScript client and application, based on the [KLIP-15 proposal](https://github.com/confluentinc/ksql/pull/4069). |
+
+
+### Running the example app
+
+You'll need a recent version of Node.js. Use npm (or yarn) to grab dependencies and compile the client:
+```sh
+# within the ksqldb-js-client/ dir
+$ npm run build
+```
+
+The sample application in `ksqldb-js-client/packages/shopping-cart-example` emulates the `ksqldb-real-app` example from KLIP-15. It reuses the server endpoint, so fire that up first:
+
+> To run it, run the Starter class in your IDE: [...]/ksql-real-app/src/main/java/io/confluent/server/Starter.java 
+
+(From `# The Application` in [ksql-dev / Client, Protocol, and new API prototype](https://groups.google.com/d/msg/ksql-dev/5mLKvtZFs4Y/HUAtYNw4AgAJ).)
+
+Then, start the JavaScript-client-based example:
+```sh
+# within the ksqldb-js-client/ dir
+$ npm run start-example
+```
+
+You should see output like:
+```
+Server running at http://localhost:1234
+```
+
+Finally, navigate your browser to the respective url.

ksql-js-client/lerna.json

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+{
+  "packages": [
+    "packages/*"
+  ],
+  "version": "0.0.0"
+}