Init rule vue/require-valid-default-prop.

Author: armano2

docs/rules/require-valid-default-prop.md

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+# Enforces prop default values to be valid. (require-valid-default-prop)
+
+Please describe the origin of the rule here.
+
+
+## Rule Details
+
+This rule aims to...
+
+Examples of **incorrect** code for this rule:
+
+```js
+
+// fill me in
+
+```
+
+Examples of **correct** code for this rule:
+
+```js
+
+// fill me in
+
+```
+
+### Options
+
+If there are any options, describe them here. Otherwise, delete this section.
+
+## When Not To Use It
+
+Give a short description of when it would be appropriate to turn off this rule.
+
+## Further Reading
+
+If there are other links that describe the issue this rule addresses, please include them here in a bulleted list.

lib/rules/require-valid-default-prop.js

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+/**
+ * @fileoverview Enforces prop default values to be valid.
+ * @author Armano
+ */
+'use strict'
+const utils = require('../utils')
+
+// ------------------------------------------------------------------------------
+// Rule Definition
+// ------------------------------------------------------------------------------
+
+module.exports = {
+  meta: {
+    docs: {
+      description: 'Enforces prop default values to be valid.',
+      category: 'Possible Errors',
+      recommended: false
+    },
+    fixable: null,  // or "code" or "whitespace"
+    schema: []
+  },
+
+  create (context) {
+    // variables should be defined here
+
+    // ----------------------------------------------------------------------
+    // Helpers
+    // ----------------------------------------------------------------------
+
+    // any helper functions should go here or else delete this section
+
+    // ----------------------------------------------------------------------
+    // Public
+    // ----------------------------------------------------------------------
+
+    return utils.executeOnVue(context, properties => {
+      // give me methods
+    })
+  }
+}