Update README and add contrib dir

contrib/tsn/model/stream-identification-function.h

@@ -0,0 +1,53 @@
+#ifndef STREAM_IDENTIFICATION_FUNCTION_H
+#define STREAM_IDENTIFICATION_FUNCTION_H
+
+#include "ns3/object.h"
+
+#include "ns3/packet.h"
+#include "ns3/nstime.h"
+
+namespace ns3
+{
+
+class StreamIdentificationFunction : public Object
+{
+  public:
+    /**
+     * \brief Get the TypeId
+     *
+     * \return The TypeId for this class
+     */
+    static TypeId GetTypeId();
+
+    /**
+     * \brief Create a StreamIdentificationFunction
+     */
+    StreamIdentificationFunction();
+
+    /**
+     * Destroy a StreamIdentificationFunction
+     *
+     * This is the destructor for the StreamIdentificationFunction.
+     */
+    ~StreamIdentificationFunction();
+
+    // Delete copy constructor and assignment operator to avoid misuse
+    StreamIdentificationFunction& operator=(const StreamIdentificationFunction&) = delete;
+    StreamIdentificationFunction(const StreamIdentificationFunction&) = delete;
+
+    virtual bool Match(Ptr<Packet> p);
+    virtual void GetActiveUpdate(Ptr<Packet> p);
+
+    Time GetHardwareLatency();
+
+  protected:
+
+  private:
+    Time m_minLatencyOverhead;
+    Time m_maxLatencyOverhead;
+
+
+};
+
+}
+#endif /* STREAM_IDENTIFICATION_FUNCTION_H */