Added simple readme

Author: ganehag

README.md

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+# SerialTerm
+
+A simple and very basic VT100 compatible serial terminal.
+
+# How to use 
+
+Click on the `hamburger meny` in the top left to access the port `settings`. Here you can change the following:
+
+- Serial port
+- Desired baudrate
+- Number of data bits
+- Parity mode
+- Number of stop bits
+
+Close the menu and clock on the button with the `blue lightning bolt`. It should change to `yellow/orange` and the label 
+should read `Connected`.
+
+That is it!
+
+
+# Good to know
+
+To copy text. Select it and use `CTRL`+`SHIFT`+`C`.
+
+Top paste text. Use `CTRL`+`SHIFT`+`V`.