Add a Docker+wasm sample application featuring a WasmEdge-based microservice, a MySQL database and an Nginx web server for frontend UI files.

Signed-off-by: Michael Yuan <michael@secondstate.io>

wasmedge-mysql-nginx/db/update_order.json

@@ -0,0 +1,9 @@
+{
+    "order_id": 3,
+    "product_id": 12,
+    "quantity": 2,
+    "amount": 56.0,
+    "shipping": 15.0,
+    "tax": 2.0,
+    "shipping_address": "123 Main Street"
+}