Add examples of .pd_lua files

Added examples of .pd_lua files, which create Lua objects that are
interpreted by PureData.

samples/Lua/h-counter.pd_lua

@@ -0,0 +1,20 @@
+
+-- A simple counting object that increments an internal counter whenever it receives a bang at its first inlet, or changes to whatever number it receives at its second inlet.
+
+local HelloCounter = pd.Class:new():register("h-counter")
+
+function HelloCounter:initialize(sel, atoms)
+	self.inlets = 2
+	self.outlets = 1
+	self.num = 0
+	return true
+end
+
+function HelloCounter:in_1_bang()
+	self:outlet(1, "float", {self.num})
+	self.num = self.num + 1
+end
+
+function HelloCounter:in_2_float(f)
+	self.num = f
+end