Proposal for numeric literal syntax. (carbon-language#143)

This proposal specifies lexical rules for numeric constants in Carbon.

Author: zygoloid

proposals/README.md

@@ -35,5 +35,6 @@ request:
 -   [0083 - In-progress design overview](p0083.md)
 -   [0120 - Add idiomatic code performance and developer-facing docs to goals](p0120.md)
     -   [Decision](p0120_decision.md)
+-   [0143 - Numeric literals](p0143.md)
 
 <!-- endproposals -->