Update README.md

README.md

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 # OpenBPS
 
-A free and open source hardware project to build a USB battery profiler and simulator.
+A free and open source hardware project to build a USB battery profiler and simulator. 
+
+The software interface will allow for controlling the OpenBPS through it's various modes.
+
+## Features
+
+- Battery Profiling
+    + Build discharge profiles for user selectable current draw
+    + Save profiles in open format and plain text for easy analysis
+    + Characterise a cell or batteries internal series resistance
+
+- Compatible Cells/Batteries
+    + Coin cells
+    + A/AAA
+    + Lithium
+    + Li-Ion / Li-Poly (upto two in series)
+
+- Cell / Battery Simulation
+    + Low noise power supply
+    + Output voltage follows profiled battery curve (whether profiled with device or supplied via CSV)
+    + Simulation can be set to start and finish at different states of charge
+
+This project will be updated as I work on software features and hardware design
+