Add XLS-6d: 0006 XLS-6d Standard for Visual Account Icons (#311)

Author: mvadari

XLS-0006-visual-account-icons/README.md

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+<pre>
+  xls: 6
+  title: Standard for Visual Account Icons
+  description: A standard for visually distinguishing XRPL accounts by generating unique icons for each account, regardless of address format.
+  author: Richard Holland (RichardAH)
+  discussion-from: https://github.com/XRPLF/XRPL-Standards/discussions/24
+  status: Final
+  category: Community
+  created: 2019-09-22
+</pre>
+
+Following from [XLS-5d](https://github.com/XRPLF/XLS-0005-standards-for-addressing), it has become necessary to provide XRPL users a way to identify their XRPL account, which effectively now has two different identifiers: an 'r-address' and an 'X-address'.
+
+To solve this problem XLS-6d provides for a standard way to visually identify accounts irrespective of which addressing system is used by the rest of the user interface.
+
+For a user account take the X-address of the account without destination tag and feed it into hashicon https://www.npmjs.com/package/hashicon
+
+For an exchange, take the X-address of the account with the destination tag and feed it into hashicon.
+
+It's recommended that these icons are displayed alongside addresses to help reduce user confusion. See examples in Figures 1 and 2.
+
+![image](https://user-images.githubusercontent.com/19866478/65387069-ba273a80-dd86-11e9-8680-34488e15401d.png)
+Figure 1
+
+![image](https://user-images.githubusercontent.com/19866478/65387078-dc20bd00-dd86-11e9-90af-126edf511060.png)
+Figure 2