add setPort() method

include/kiwixserve.h

@@ -17,6 +17,7 @@ class KiwixServe
     void shutDown();
     bool isRunning();
     int getPort() { return m_port; }
+    int setPort(int port);
 
   private:
   std::unique_ptr<Subprocess> mp_kiwixServe;

src/kiwixserve.cpp

@@ -68,4 +68,14 @@ bool KiwixServe::isRunning()
     return false;
 }
 
+int KiwixServe::setPort(int port)
+{
+    if (port >= 1 && port <= 65535) {
+        m_port = port;
+    } else {
+        return -1;
+    }
+    return m_port;
+}
+
 }