Update README.md

README.md

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 # Piefiller
 Graphical profiler for Love2D 9.2
+#Usage
+1) require the file:
+```lua
+  piefiller = require("piefiller")
+```
+2) make a new instance of piefiller
+```lua
+  Pie = piefiller:new()
+```
+3) attach the piefiller to the part of your application that you want to monitor, it can be whatever but I suggest calling it in love.update or love.draw as this is what piefiller is all about.
+
+```lua
+ function love.update()
+	Pie:attach()
+		-- do something
+	Pie:dettach()
+ end
+```
+4) draw the output in your draw function and give event hooks for your pie.
+```lua
+ function love.draw()
+	Pie:draw()
+ end
+ function love.keypressed(...)
+ 	Pie:keypressed(...)
+ end
+ function love.mousepressed(...)
+ 	Pie:mousepressed(...)
+ end
+```
+5) When you get sufficient output press the "P" key to output to file.
+#Keys
+r 	= resets the pie 
+
+up 	= decreases depth 
+
+down 	= increases depth 
+
+, 	= decreases step size 
+
+.	= increases step size 
+
+s	= shortens the names displayed
+
+c	= hides/shows hidden processes
+
+p	= saves to file called "Profile" and opens directory for you
+# Additional notes
+The best depth to search for is 2 and 3.
+
+When used in large applications the output is difficult to read, however printing to file resolves this issue.
+# Planned features
+Make sure that text does not overlay.