add a markdown document to convert bash to batch

Copyright (C) 2020 ECORP SAS - Author: Vincent Bourgmayer

Conversion bash to batch

This files contains mapping of bash command for batch

# Expression bash  => batch

## Declaration

- `var="foo" => `set "var=foo"`

- `var=1` => `set /a "var=1"

## Condition:

- `if [ -z ${var} ] then #do smtg fi` => `if defined var #do smtg`

## File manipulation

- `mkdir -p /path/to/file` => `mkdir path\to\file`

- `mkdir -p ${path}` => `mkdir %path%` 

## Process

- `exit 101` => `exit /b 101`

- `if [ $? > 0]` => `if not errorLevel 1 <cmd>` 

- `var=$1` => `set "var=%1"`

## Other

- `sha256sum -c ${FILENAME}.sha256sum` => `certUtil ??????????`

- `wget` => `curl` 

- `ping -c` => `ping -r`