[Dana] Add syntax highlighting extension for Vim/NeoVim (#85)

Added a Dana syntax highlight extension for vim

Author: AntonisAk

dana/vim_syntax/README.MD

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+A simple Dana syntax highlight extension for Vim, based on the Pascal extension.
+
+## Installation
+
+1. **Copy the syntax file:**
+	- Copy `syntax/dana.vim` to `~/.vim/syntax/` or `~/.config/nvim/syntax/`.
+
+2. **Enable auto highlighting for `.dana` files:** [optional]
+	- Copy `ftdetect/dana.vim` to `~/.vim/ftdetect/` or `~/.config/nvim/ftdetect/`.

dana/vim_syntax/ftdetect/dana.vim

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+au BufNewFile,BufRead *.dana set filetype=dana

dana/vim_syntax/syntax/dana.vim

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+"=============================================================================
+" File:          dana.vim
+" Description:   Vim syntax file for Dana Language 
+"=============================================================================
+
+if exists("b:current_syntax")
+  finish
+endif
+
+
+syn case ignore
+syn sync lines=250
+
+" Keywords
+syn keyword danaBoolean	    true false
+syn keyword danaConditional	if elif else 
+syn keyword danaOperator	and not or 
+syn keyword danaLoop	    loop
+syn keyword danaStatement	begin end skip exit return break continue 
+syn keyword danaType		int byte ref
+syn keyword danaDefinition def decl var
+
+" Operators
+syn match   danaSymbolOperator  /+\|=\|−\|<>\|*\|<\|\/\|>\|%\|<=\|!\|>=\|&\|||/
+syn match   danaSymbolOperator  ":="
+syn keyword danaOperator	as is
+
+" Delimiters
+syn match danaDelimiter /[()\[\],]\|:\ze[^=]/
+
+" Match any identifier except for statement keywords
+syn match   danaIdentifier		"\<[a-zA-Z][a-zA-Z0-9_]*\>"
+
+
+" Built-in library functions
+syn keyword danaFunction writeInteger writeByte writeChar writeString readInteger readByte readChar readString extend shrink strlen strcmp strcpy strcat
+
+" Numbers
+syn match danaNumber /\<\d\+\>/
+
+" Character literal: '\([^'"\\]\|\\\(n\|t\|r\|0\|\\\|'\|"\|x[0-9a-fA-F][0-9a-fA-F]\)\)'
+syn match danaChar /'\([^'"\\]\|\\\(n\|t\|r\|0\|\\\|'\|"\|x[0-9a-fA-F][0-9a-fA-F]\)\)'/
+
+" String literal: "([^'"\n\\]\|ESC)*"
+syn match danaString /"\([^'"\n\\]\|\\\(n\|t\|r\|0\|\\\|'\|"\|x[0-9a-fA-F][0-9a-fA-F]\)\)*"/
+
+" Comments
+syn match danaComment /#.*$/
+syn region danaComment start="(\*" end="\*)"
+
+hi def link danaBoolean		    Boolean
+hi def link danaChar            Character
+hi def link danaComment		    Comment
+hi def link danaConditional		Conditional
+hi def link danaDefinition    Statement
+hi def link danaDelimiter     Delimiter
+hi def link danaFuncCall Function
+hi def link danaFunction		Function
+hi def link danaNumber		    Number
+hi def link danaOperator		Operator
+hi def link danaLoop		    Repeat
+hi def link danaStatement		Statement
+hi def link danaString		    String
+hi def link danaSymbolOperator	danaOperator
+hi def link danaType			Type
+
+let b:current_syntax = "dana"