Beetle ble with SD card reader
Eventually I got it working. The connections that i made are as follows:


SDA pin on beetle -> SDA pin on SD card module
SCL pin on beetle -> SCL pin on SD card module  
GND pin on beetle -> GND pin on SD card module
VCC pin on beetle -> VIN pin on SD card module


Then upload the sample code present on arduino IDE, or you can find it here as well: https://www.arduino.cc/en/Tutorial/ReadWrite

There we go!

EDIT: The soldering is tricky for bluno beetle. Detailed instructions can be found here :