add readme and license

README.md

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+# [proposal: crypto/rand: add UUIDv4 and UUIDv7](https://golang.org/issue/76319)
+
+This package is an implementation of the crypto/rand API amended as proposed by #76319.
+
+```go
+// UUIDv4 generates a RFC 9562 Version 4 UUID
+// using only random bytes in the format: 
+// xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx.
+func UUIDv4() string
+
+// UUIDv7 generates a RFC 9562 Version 7 UUID
+// using the current time and random bytes in the format:
+// xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx.
+func UUIDv7() string
+```
+
+The UUID functions forward to github.com/google/uuid.
+The rest forward to crypto/rand.
+Unless you are changing the value of rand.Reader, this package a drop-in replacement for crypto/rand.
+
+This is an ergonomics test.
+Most other UUID packages define `[16]byte` types, but #76319 proposes to add functions that return only the string forms of UUIDs.
+You can use this package to check whether the proposed API works (better?) for you.
+
+There are questions that have been raised about the proposed API, especially with regard to the clock component of v7 UUIDs.
+This package does not address those.