Add long-description to alire.toml

Author: damaki

alire.toml

@@ -1,7 +1,13 @@
 name = "libsap"
-description = "Asynchronous message-passing for protocol stacks"
+description = "Asynchronous message passing for protocol stacks"
 version = "0.1.0"
 
+long-description = """
+Provides utilities to create _Service Access Points_ (SAP) for asynchronous,
+zero-copy message passing between tasks based on _Service Primitive_ messages
+(request, confirm, indication, and response primitives).
+"""
+
 authors = ["Daniel King"]
 maintainers = ["Daniel King <damaki.gh@gmail.com>"]
 maintainers-logins = ["damaki"]