Update README.md

Author: alejoar

README.md

@@ -1,2 +1,21 @@
 papiplot
 ========
+
+	PapiPlot options:
+	-p [path]	 Set path to the papi-output folder generated with Papify. If not specified, current directory will be used.
+
+	-x [res_x]	 Change horizontal resolution. If not specified, default is 1680.
+
+	-y [res_y]	 Change vertical resolution. If not specified, default is 1050.
+
+	-t [font size]	 Change tics font size. If not specified, default is 8.
+
+	-l [font size]	 Change labels font size. If not specified, default is 8.
+
+	-n 	 	No labels will be printed
+
+	-h 	 	Print help
+
+	PapiPlot requires GNUPLOT. If not installed, assuming you are on Ubuntu, run:
+	sudo apt-get install gnuplot
+