Init wasm tests folder

.gitignore

@@ -37,6 +37,4 @@
 /src
 /mapfile
 /tools/python/__pycache__/
-/wasm/cache
-/wasm/dist
 /build

wasm/.gitignore

 *.mp4
+/node_modules
+/dist
+/cache

wasm/package.json

+{
+  "name": "@ffmpeg/core",
+  "version": "0.8.0",
+  "description": "ffmpeg.wasm core",
+  "main": "dist/ffmpeg-core.js",
+  "scripts": {
+    "test": "jest"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/ffmpegwasm/FFmpeg.git"
+  },
+  "keywords": [
+    "ffmpeg",
+    "webassembly",
+    "video",
+    "audio",
+    "transcode"
+  ],
+  "author": "jeromewus@gmail.com",
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/ffmpegwasm/FFmpeg/issues"
+  },
+  "homepage": "https://github.com/ffmpegwasm/FFmpeg#readme",
+  "devDependencies": {
+    "jest": "^26.4.2"
+  }
+}