feat: new separate frontend and backend folders with fastify as nodejs framework, libreconvert is configured in fastify as route

backend/tsconfig.json

@@ -0,0 +1,10 @@
+{
+  "compilerOptions": {
+    "target": "ES6",
+    "module": "CommonJS",
+    "outDir": "./dist",
+    "rootDir": "./src",
+    "strict": true,
+    "allowSyntheticDefaultImports": true
+  }
+}