Added github readme

SPUI/README.md

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+Stale Pixels User Interface tools (aka SPUI)
+--
+
+Abstract
+==
+SPUI is a DotCommand for the ZX Spectrum Next. It's primary (sole?) purpose is to make the creation of User Interaction 
+flows from NextBASIC (a) easier; (b) less ugly; (c) less effort; (d) consistent.
+
+Quick Start
+==
+.SPUI -h  will get you the built-in help.
+
+When building GUIs the second parameter <TYPE> is compulsory. 
+
+Currently the only supported type is MENU.
+
+Parameters
+==
+ * -x =  X position, aka left most column
+ * -y =  Y position, aka top most row
+ * -r =  Rows used for content, aka height
+ * -c =  Columns used for content, aka width
+ * -t =  Title of the dialog box
+
+Setup
+==
+ To prevent unexpected side-effects, unless instructed, you should pre-load Register 0x7F with 0.
+
+Types
+==
+*MENU*
+ A list of menu entries follow the type and optional parameters. These strings are presented in a 128k style menu.  The selected item is returned in Reg 0x7F.  This is 0 is the menu is cancelled with BREAK.
+
+More Information
+==
+See the /docs/ folder
+
+--Xalior, 20200428