Add Charencoding and UTF8

glossary/Character-encoding.md

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+### Character encoding
+
+A character encoding defines a mapping between bytes and text, specifying how the sequenece of bytes should be interpreted.
+Two commonly used character encodings are ASCII and UTF-8.

glossary/UTF-8.md

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+### UTF-8
+
+UTF-8 stands for UCS Transformation Format 8 and is a commonly used character encoding.
+UTF-8 is backwards compatible with ASCII and can represent and standard Unicode character.