WASM instance setup (#11)

* Code for running wasm file.

* Add test for wasm exported function.

* Use target names for build files.

Co-authored-by: nabarun <nabarun@deepstacksoft.com>

packages/graph-node/assembly/index.ts

@@ -0,0 +1,5 @@
+// The entry file of your WebAssembly module.
+
+export function add (a: i32, b: i32): i32 {
+  return a + b;
+}

packages/graph-node/assembly/tsconfig.json

@@ -0,0 +1,6 @@
+{
+  "extends": "assemblyscript/std/assembly.json",
+  "include": [
+    "./**/*.ts"
+  ]
+}