Update readme and return object when emtpty

Author: larsvankleef

README.md

@@ -0,0 +1,24 @@
+# Validate
+
+```js
+const { validate, email, length } = require('validate')
+
+const rules = {
+  fields: {
+    email: {
+      validator: () => {
+        return email(value) && length(value, { max: 75 })
+      },
+    },
+    password: {
+      validator: () => {
+        return length(value, { min: 18, max: 45 })
+      },
+    }
+  }
+}
+
+const { valid } = validate(fields, {
+  rules,
+})
+```

REAMD.md

@@ -1,6 +1,6 @@
 function validate (fields, { rules }) {
   if (isEmpty(fields)) {
-    return false
+    return { valid: false, results: [] }
   }
 
   const checked = []