update readme with features

README.md

@@ -2,3 +2,9 @@
 # A simple extension for BlueOS intended for collection of time-sync'd sonar and GPS data. 
 
 # Future feature ideas: 
+# - Fix bar at top that scrolls down to hide
+# -WP Survey speed parameter control on page?
+# -User controlled confidence filter on live and/or logged data?
+# -Show GPS speed over ground in table, HDOP
+# -User configurable color gradient to depth mapping
+# -Better mobile experience - scaling corner logos