Added tools for STM32W.

tools/stm32w/stm32w_flasher/linux/README

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+STM32W Flasher 1.1.0b1 for Linux
+
+A programmer for MB851 development boards based on STM32W108 microcontroller.
+
+- Installation
+
+	Installation is not required.
+	Hal package has to be present in your system.
+
+
+- Usage
+
+	Run the program with -h option for usage info.
+
+
+- Notes
+
+	This program may require root privileges.
+	In Ubuntu, if you want to flash using Make, type 'sudo -s' before that.
+	 
+	This version of STM32W Flasher does not support jlink yet.
+