update install certificate linux

commands to install linux certs.

README.md

@@ -23,7 +23,21 @@ certutil -addstore -user -f "Root" "%CA_FILE_PATH%"
 </pre>
 
 ### Linux
-To be provided
+In linux we can use terminal. 
+#### cmd
+To enter into the terminal, press ctrl + alt + t. That will open the terminal console. Write the following commands to install this certificate. Adding certificate this way will make it valid in chrome, and firefox. 
+<pre>
+export CA_RAW_URL=https://git.code.tecnalia.com/smartdatalab/ca/-/raw/master/ca.crt.pem
+export TEMP_PATH=$(mktemp -d)
+export CA_FILE_PATH=$TEMP_PATH/ca.crt.pem
+echo download ca from $CA_RAW_URL to $CA_FILE_PATH
+wget $CA_RAW_URL -O $CA_FILE_PATH
+echo check downloaded ca
+[ -f $CA_FILE_PATH ] && echo "File exist" || echo "File does not exist"
+echo add ca to the certificate store
+sudo cp $CA_FILE_PATH /usr/local/share/ca-certificates/ca.crt.crt
+sudo update-ca-certificates
+</pre>
 
 ## How to create certificates based on it