asciiart: add page (#4962)

pages/linux/asciiart.md

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+# asciiart
+
+> Convert images to ASCII.
+> More information: <https://github.com/nodanaonlyzuul/asciiart>.
+
+- Read an image from a file and print in ASCII:
+
+`asciiart {{path/to/image.jpg}}`
+
+- Read an image from a URL and print in ASCII:
+
+`asciiart {{www.example.com/image.jpg}}`
+
+- Choose the output width (default is 100):
+
+`asciiart -width {{50}} {{path/to/image.jpg}}`
+
+- Colorize the ASCII output:
+
+`asciiart --color {{path/to/image.jpg}}`
+
+- Choose the output format (default format is text):
+
+`asciiart --format {{text|html}} {{path/to/image.jpg}}`
+
+- Invert the character map:
+
+`asciiart --invert-chars {{path/to/image.jpg}}`