Add release notes

Author: SeanTAllen

.release-notes/multiple-binary.md

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+## Support applications installing more than 1 binary
+
+The original design of ponyup was that you would install an application such as ponyc that in turn contained a single binary that shared the same name.
+
+We recently started including the Pony language server in the distribution with ponyc. Ponyup could install the distribution but would only install into the user's PATH the ponyc binary.
+
+We've added support for application distributions to contain more than one binary that will be linked into the user's PATH.
+
+The practical implication is that when you install a ponyc distribution that also contains `pony-lsp`, both `ponyc` and `pony-lsp` will be available via your PATH.