[C#] Add packaging artifacts to build a .nuget zip

[ldk-java] / c_sharp / packaging_artifacts / LICENSE-MIT

diff --git a/c_sharp/packaging_artifacts/LICENSE-MIT b/c_sharp/packaging_artifacts/LICENSE-MIT
new file mode 120000 (symlink)
index 0000000..b2cfbdc
--- /dev/null
+++ b/c_sharp/packaging_artifacts/LICENSE-MIT
@@ -0,0 +1 @@
+../../LICENSE-MIT
\ No newline at end of file