Add Bash Scripts

[mr-bigdeli]

• 01 create a function that accepts dynamic arguments and sums them together and returns the result.
  Project name: function-dynamic-arguments
  Commit: add script:core function-dynamic-arguments

• 02 create a function that gets a string and prints it in bold format.
  Project name: function-print-bold-string
  Commit: add script:core function-print-bold-string

• 03 create a function that gets a string and prints it in italic format.
  Project name: function-print-italic-string
  Commit: add script:core function-print-italic-string

• 04 create a function that gets a string and prints it in the given colour.
  Project name: function-print-colored-string
  Commit: add script:core function-print-colored-string

• 05 create a function that gets a path and shows its total size in megabytes.
  Project name: function-get-directory-size
  Commit: add script:core function-get-directory-size