Update readme to sqlite use

README.md

@@ -1,25 +1,6 @@
-# Signal K to dynamic mySQL polar table
+# Signal K to dynamic sqlite polar table
 
 [![Greenkeeper badge](https://badges.greenkeeper.io/joabakk/signalk-polar.svg)](https://greenkeeper.io/)
 Signal K Node server plugin to compare performance and write best performance to  [mySQL](https://www.mysql.com/), database.
 
-This is the backend for https://github.com/joabakk/signalk-polar-graphing, to be able to visually see current performance compared to previous sailed performance. 
-
-The plugin assumes that mySQL is installed and the database you specify exists. The database must be called 'polar' and the table can be created with the mySQL command:
-```
-CREATE TABLE `polar` (
-  `id` int(11) unsigned NOT NULL AUTO_INCREMENT,
-  `timestamp` text,
-  `environmentWindSpeedApparent` double DEFAULT NULL,
-  `environmentWindSpeedTrue` double DEFAULT NULL,
-  `environmentWindAngleApparent` double DEFAULT NULL,
-  `environmentWindAngleTrueGround` double DEFAULT NULL,
-  `navigationSpeedThroughWater` double DEFAULT NULL,
-  `performanceVelocityMadeGood` double DEFAULT NULL,
-  `tack` text,
-  `navigationRateOfTurn` double DEFAULT NULL,
-  PRIMARY KEY (`id`)
-) ENGINE=InnoDB AUTO_INCREMENT=309 DEFAULT CHARSET=latin1;
-```
-
-And create a user name and password if you do not want to use the root password to mySQL
+This is the backend for https://github.com/joabakk/signalk-polar-graphing, to be able to visually see current performance compared to previous sailed performance.