add 'class' example

examples/class/main.py

@@ -0,0 +1,25 @@
+# need core > v1.4.0
+import PikaStdLib
+
+class people:
+    def do_hi(self):
+        print('hello i am people')
+    def hi(self):
+        self.do_hi(self)
+
+class student(people):
+    def do_hi(self):
+        print('hello i am student')
+
+class mymem(PikaStdLib.MemChecker):
+    def mymax(self):
+        print('mem used max: ' + str(self.getMax()) + ' kB')
+
+p = people()
+s = student()
+
+p.hi()
+s.hi()
+
+mem = mymem()
+mem.mymax()