README: warn people away from thinking this is ready for use

diff --git a/README.md b/README.md
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@@ -1,2 +1,4 @@
 # spake2.rs
 the SPAKE2 password-authenticated key-exchange algorithm, in Rust
+
+NOTE: this is just a beginning: you should absolutely not use this for anything at all yet. It has a long way to go. Wait until it has a real version number and has been published to crates.io.