added readme

Readme.md

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+# XcmsViewer dockerized version
+
+The code available here is adapted from https://github.com/mengchen18/xcmsViewer
+
+## Run
+To run XcmsView in docker, first build the Docker image with Docker installed on the system,
+
+```docker build . -t xcmsv```
+
+
+Then put the data to be viewed in the local directoryand run :
+
+```docker run -p 3838:3838 -v .:/home/shiny/data  xcmsv```
+
+Finally open localhost:3838 in your browser, log in with password "metabohub" 
+
+
+## Password
+The default web page password is "metabohub", it can be changed in landingPage.R, line 32.
+
+## Port and address
+Port and address can be changed with environment variables :
+
+```docker run --env HOST="127.0.0.1" --env PORT=3737 -p 3737:3737 -v .:/home/shiny/data xcmsv```
+
+## Change data directory
+XcmsViewer retrieves its data from /home/shiny/data inside the docker container, so it is possible to specify the local data directory by changing the docker volume setting.
+For example, to use /data as data dir on the host :
+
+```docker run -p 3838:3838 -v /data:/home/shiny/data  xcmsv```
+
+