Set up webpack library backed by zcash-client-backend-wasm

zcash-client-sdk-js/webpack.config.js

@@ -0,0 +1,10 @@
+var path = require('path')
+
+module.exports = {
+  entry: './src/index.js',
+  output: {
+    path: path.resolve(__dirname, 'dist'),
+    filename: 'zcash-client-sdk.js',
+    library: 'zcashClientSdk'
+  }
+}