sodium: import FFI stub

diff --git a/extra/sodium/authors.txt b/extra/sodium/authors.txt
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+++ b/extra/sodium/authors.txt
@@ -0,0 +1 @@
+Alexander Ilin

diff --git a/extra/sodium/ffi/ffi.factor b/extra/sodium/ffi/ffi.factor
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+++ b/extra/sodium/ffi/ffi.factor
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+! Copyright (C) 2017 Alexander Ilin.
+! See http://factorcode.org/license.txt for BSD license.
+USING: alien alien.libraries alien.syntax combinators system ;
+IN: sodium.ffi
+
+<< "sodium" {
+    { [ os windows? ] [ "libsodium.dll" ] }
+    { [ os macosx? ] [ "libsodium.dylib" ] }
+    { [ os unix? ] [ "libsodium.so" ] }
+} cond cdecl add-library >>
+
+LIBRARY: sodium

diff --git a/extra/sodium/summary.txt b/extra/sodium/summary.txt
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+++ b/extra/sodium/summary.txt
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+The Sodium crypto library