Add 'Vars.md'

Vars.md

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+# Standard variable definition 
+
+## Package manager
+###PKGM: defines package manager
+Options
+```
+PKGM="apt" #Normal view
+PKGM="debconf-apt-progress -- apt" #Whiptail view
+```
+Usage
+```
+As replacement for package manager command (example: apt)
+Defining pakage manager for use in other Vars
+```
+
+###PKGI: defines command to install command (requires PKGM to be set)
+Options
+```
+PKGI="${PKGM} install -y"
+```
+Usage
+```
+$PKGI <package name>
+```
+
+
+###PKGA: defines command to add repo 
+Options
+```
+PKGA="add-apt-repository" (software-properties-common is required)
+```
+Usage
+```
+$PKGA ppa:ondrej/php -y
+```
+
+## Other
+###OUTPUT: used to silence a script 
+Options
+```
+OUTPUT='/dev/null' #Hide output
+OUTPUT='/dev/tty'  #Display output
+```
+Usage
+```
+YourCommand > $OUTPUT 2>&1
+```
+