Swift: Add 'TaintTracking.qll'.

Author: MathiasVP

swift/ql/lib/codeql/swift/dataflow/TaintTracking.qll

@@ -0,0 +1,7 @@
+/**
+ * Provides classes for performing local (intra-procedural) and
+ * global (inter-procedural) taint-tracking analyses.
+ */
+module TaintTracking {
+  import codeql.swift.dataflow.internal.tainttracking1.TaintTrackingImpl
+}