Add build script and readme

.gitignore

@@ -1,3 +1,4 @@
 node_modules
 dist
-.cache
+.cache
+yarn-error.log

README.md

@@ -0,0 +1,9 @@
+# /tg/ handbook
+
+## Building
+
+`yarn build`
+
+## Development
+
+`yarn && yarn dev`

package.json

@@ -4,7 +4,8 @@
   "main": "index.js",
   "license": "MIT",
   "scripts": {
-    "dev": "parcel index.html"
+    "dev": "parcel index.html",
+    "build": "parcel build index.html"
   },
   "devDependencies": {
     "parcel-bundler": "^1.12.4",