add Julia language

Author: patch

count-bytes/julia.md

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+# Count encoded bytes in Julia
+
+The core `endof` function returns the number of bytes in UTF-8 when called on a
+string.
+
+```julia
+count = endof(str)
+```

count-characters/julia.md

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+# Count characters of a string in Julia
+
+## Code points
+
+The core `length` function returns the number of code points when called on a string.
+
+```julia
+count = length(str)
+```
+
+## Grapheme clusters
+
+The [UnicodeExtras](https://github.com/nolta/UnicodeExtras.jl) module provides
+the `length` function, which returns the number of grapheme clusters when called
+on a string.
+
+```julia
+using UnicodeExtras
+
+count = length(str)
+```

encode-decode/julia.md

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+# Encode and decode in Julia
+
+The [UnicodeExtras](https://github.com/nolta/UnicodeExtras.jl) module provides
+the `encode` function, which accepts a string and returns an array of bytes in
+the specified encoding, and the `decode` function, which accepts an array of
+bytes in the specified encoding and returns a string.
+
+```julia
+using UnicodeExtras
+
+utf16 = encode(str,   'UTF-16')
+str   = decode(utf16, 'UTF-16')
+```

letter-casing/julia.md

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+# Letter Casing in Julia
+
+The [UnicodeExtras](https://github.com/nolta/UnicodeExtras.jl) module provides
+the `lowercase`, `uppercase`, `titlecase`, and `foldcase` functions.
+
+```julia
+lowercase = lowercase(str)
+uppercase = uppercase(str)
+titlecase = titlecase(str)
+casefold  = foldcase(str)
+```

source-code/julia.md

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+# UTF-8 source code in Julia
+
+Source code is expected to be UTF-8 by default.