last update to Readme

Readme.md

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-# Raspberry zero config
+# Raspberry zero w configuration
+This repository guides the setup and configuration of the Raspberry Pi Zero (w). The complete configuration consist of (1) raspberry image writing, (2) SSH and WiFi configuration, and (3) first connection over SSH.
+
+# Raspberry image preparation 
+
+The Raspberry Pi imager is a tool that allows to configure and write an specific OS version for all Raspberry Pi devices. Thus, it is necessary to choose the required device — Zero w in this case — and t
+
 ## SSH over USB
 With the micro SD card ready we can now plug the USB cable to our host and Pi Zero. However, note that while the Pi Zero has two micro USB port, only one supports USB On-The-Go (OTG). It is this feature that will allows us to treat the connection as an Ethernet connection. The port in question is the innermost one, the one closer to the center of the board, as shown in the image below.