add hex-encoding proposal

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diff --git a/doc/proposals/2022-07-case-insensitive-hex.md b/doc/proposals/2022-07-case-insensitive-hex.md
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+# Proposal
+
+Require that Sigsum's ASCII parser uses case-insensitive hex, see [RFC 4648][].
+
+[RFC 4648]: https://datatracker.ietf.org/doc/html/rfc4648#section-8
+
+# Motivation
+
+The requirement to use lower-case hex makes it harder to debug Sigsum logs on
+the command line in some environments; some common library implementations
+output either lower-case or upper-case hex while parsing is case-insensitive;
+and even if no hex parser is available (so it must be implemented from scratch)
+it is not much harder to implement as in [RFC 4648][].