Add URL Format ERC

EIPS/eip-831.md

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+## Preamble
+
+    EIP: 831
+    Title: URL Format for Ethereum
+    Author: ligi <[email protected]>
+    Type: Standard Track
+    Category: ERC
+    Status: Draft
+    Replaces: 67
+    Created: 2018-01-15
+
+## Simple Summary
+
+A standard way of creating Ethereum URLs for various use-cases.
+
+## Abstract
+
+URLs embedded in QR-codes, hyperlinks in web-pages, emails or chat messages provide for robust cross-application signaling between very loosely coupled applications. A standardized URL format allows for instant invocation of the user's preferred wallet application.
+
+## Motivation
+
+The need for this ERC emerged when refining ERC-681. We need a container ERC that does not carry the weight of the use-cases and just serves the container for them.
+
+## Specification
+
+### Syntax
+
+Ethereum URLs contain "ethereum" in their schema (protocol) part and are constructed as follows:
+
+    request                 = "ethereum" ":" [ prefix "-" ] payload
+    prefix                  = STRING
+    payload                 = STRING
+
+### Semantics
+
+`prefix` is optional and defines the use-case for this URL. If no prefix is given "pay-" is assumed to be concise and ensure backward compatibility to ERC-67
+
+`payload` is mandatory and the content depends on the prefix. Structuring of the content is defined in the ERC for the specific use-case and not in the scope of this document. One example is ERC-681 for the pay- prefix.
+
+## Copyright
+
+Copyright and related rights waived via [CC0](https://creativecommons.org/publicdomain/zero/1.0/).