📝 docs(vuepress): add no-raw-text rule spec

Author: kazupon

docs/rules/no-raw-text.md

@@ -0,0 +1,65 @@
+# vue-i18n/no-raw-text
+
+> disallow to string literal in template or JSX
+
+This rule warns the usage of string literal.
+
+This rule encourage i18n in about the application needs to be localized.
+
+## :book: Rule Details
+
+:-1: Examples of **incorrect** code for this rule:
+
+`template` option:
+```js
+const MyComponent = {
+  // ✗ BAD
+  template: '<p>hello</p>',
+  // ...
+}
+```
+
+`template` block of single-file components:
+```vue
+<template>
+  <!-- ✗ BAD -->
+  <p>hello</p>
+</template>
+```
+
+`JSX`:
+```js
+const MyComponent = {
+  // ✗ BAD
+  render: h => (<p>hello</p>)
+  // ...
+}
+```
+
+:+1: Examples of **correct** code for this rule:
+
+`template` option:
+```js
+const MyComponent = {
+  // ✓ GOOD
+  template: '<p>{{ $('hello') }}</p>',
+  // ...
+}
+```
+
+`template` block of single-file components:
+```vue
+<template>
+  <!-- ✓ GOOD -->
+  <p>{{ $t('hello') }}</p>
+</template>
+```
+
+`JSX`:
+```js
+const MyComponent = {
+  // ✓ GOOD
+  render: h => (<p>this.$t('hello')</p>)
+  // ...
+}
+```