Added README file

README.md

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+pam_usb provides hardware authentication for Linux using ordinary USB Flash Drives.
+
+It works with any application supporting PAM, such as _su_, any login manager (_GDM_, _KDM_), etc. The pam_usb package contains:
+
+* A PAM Module
+    * Password-less authentication. Use your USB stick for authentication, don't type passwords anymore.
+    * Device auto probing.You don't need to mount the device, or even to configure the device location (_sda1_, _sdb1_, etc). pam_usb.so will automatically locate the device using _HAL_ and access its data by itself.
+    * Two-factor authentication. Achieve greater security by requiring both the USB stick and the password to authenticate the user.
+    * Non-intrusive. pam_usb doesn't require any modifications of the USB storage device to work (no additional partitions required).
+    * USB Serial number, model and vendor verification.
+    * Support for **One Time Pads** authentication.
+    * You can use the same device accross multiple machines.
+    * Support for all kind of removable devices (SD, MMC, etc).
+* Several tools
+    * **pamusb-agent**: trigger actions (such as locking the screen) upon device authentication and removal.
+    * **pamusb-conf**: configuration helper.
+    * **pamusb-check**: integrate pam_usb's authentication engine within your scripts or applications.