add build script

package.json

@@ -7,7 +7,8 @@
   "author": "dholms <dtholmgren@gmail.com>",
   "license": "MIT",
   "scripts": {
-    "start": "ts-node src/index.ts"
+    "start": "ts-node src/index.ts",
+    "build": "tsc"
   },
   "dependencies": {
     "@atproto/did-resolver": "^0.1.0",

tsconfig.json

@@ -0,0 +1,21 @@
+
+{
+  "compilerOptions": {
+    "lib": [
+      "ESNext",
+    ], 
+    "outDir": "dist",
+    "module": "CommonJS",
+    "target": "ES6",
+    "esModuleInterop": true,
+    "moduleResolution": "node",
+    "alwaysStrict": true,
+    "allowUnreachableCode": false,
+    "strictNullChecks": true,
+    "skipLibCheck": true
+  },
+  "include": ["./src/**/*.ts"],
+  "exclude": [
+    "node_modules"
+  ]
+}