add example for loading a pair style

examples/plugins/morse2plugin.cpp

@@ -0,0 +1,29 @@
+
+#include "lammpsplugin.h"
+
+#include "lammps.h"
+#include "version.h"
+
+#include <cstring>
+
+#include "pair_morse2.h"
+
+using namespace LAMMPS_NS;
+
+static Pair *morse2creator(LAMMPS *lmp)
+{
+    return new PairMorse2(lmp);
+}
+
+static lammpsplugin_t plugin;
+void lammpsplugin_init(void *lmp)
+{
+    memset(&plugin,0,sizeof(lammpsplugin_t));
+    plugin.version = LAMMPS_VERSION;
+    plugin.style   = "pair";
+    plugin.name    = "morse2";
+    plugin.info    = "Morse2 variant pair style v1.0 by Axel Kohlmeyer";
+    plugin.creator = (lammpsplugin_factory *) &morse2creator;
+    
+    lammpsplugin_register(&plugin, (LAMMPS *)lmp);
+}