Adding readme.md to my keymap

keyboards/planck/keymaps/ishtob/readme.md

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+![Planck Layout Image](https://i.imgur.com/yKewjWW.jpg)
+
+#Ishtob's personal planck layout
+
+THis is the default layout used with my planck light, though the rest of the keymap could also be used for the full sized planck or let's split.
+
+
+Main difference with the default layout:
+
+* Tab take the upper left key, made into a Tap layer to access the symbols from the number row
+
+* Esc moved to lower corner
+
+* Capslock is on the base layer as it is used quite often with my work's software
+
+* Numbers layer on lower is positioned to resemble a numpad with 5 taking the location of J for the homing bump and easier entry
+
+
+# Secret Macros
+
+`macros_public.h` contains a list of macros that can be replaced with passwords or other sensative private macros. `macros_private.h` will be used if it exsists in the folder during compiling and will ignore `macros_public.h` The private macros can be excluded from git commits by adding it to the exclusion list.