Added code, update readme and gitignore

README.md

@@ -1,2 +1,20 @@
 # tlt-gps-replay
-Replay TLT gps.txt files.
+Replay TLT gps.txt files. Use something like [tlt-gps-downloader](https://github.com/eetnaviation/tlt-gps-downloader) to download gps files.
+
+## Usage
+Install express module:
+```
+npm i express
+```
+Run app
+```
+node server.js
+```
+Go to web UI
+```
+http://localhost:3000/
+```
+
+## Supplying files
+It needs gps files in this name format: gps-year-month-day-HOUR_MINUTE_SECOND.txt
+Put them in a folder named gps/