add docs for enterprise alert component

website/components/enterprise-alert/README.md

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+# Enterprise Alert Component
+
+This component is an easy way to mark some content as only applicable to the enterprise version of consul. It can be used in any documentation pages in a variety of ways. The basic implementation is written as such, on its own line within a markdown file:
+
+```jsx
+<EnterpriseAlert />
+```
+
+And renders [like this](https://p176.p0.n0.cdn.getcloudapp.com/items/geuWOzkz/Screen%20Shot%202020-05-08%20at%204.17.34%20PM.png?v=2ace1c70f48cf1bbdd17f9ce96684453)
+
+The default text can also be replaced with custom text as such:
+
+```jsx
+<EnterpriseAlert>
+  Custom text <a href="">with a link</a>
+</EnterpriseAlert>
+```
+
+Which renders [as such](https://p176.p0.n0.cdn.getcloudapp.com/items/v1uDE2vQ/Screen%20Shot%202020-05-08%20at%204.18.22%20PM.png?v=3a45268830fac868be50047060bb4303)
+
+Finally, it can be rendered inline as a "tag" to mark a section or option as enterprise only by adding the `inline` attribute:
+
+```jsx
+<EnterpriseAlert inline>
+```
+
+This is typically used after a list item, or after a headline. It renders [as such](https://p176.p0.n0.cdn.getcloudapp.com/items/KouqnrOm/Screen%20Shot%202020-05-08%20at%204.16.34%20PM.png?v=ac21328916aa98a1a853cde5989058bd)