[ new ] Add support for Idris 2 programming language

tests/syntax-tests/source/Idris2/LICENSE.md

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+The `test.idr` file has been added from https://github.com/buzden/sublime-syntax-idris2 under the following license:
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0

tests/syntax-tests/source/Idris2/test.idr

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+-- some code in Idris
+module XX.X'''
+
+import Data.Nat
+
+data X = A | B
+
+namespace X
+  ||| Documentation
+  record Y where
+    [noHints]
+    constructor MkY'
+    field1 : Nat
+    {auto x : Nat}
+
+namespace X' {
+  parameters (x : A (Maybe b))
+    x : Nat
+}
+
+u : ()
+u = ()
+
+k, w, u : Char
+k = '\NUL'
+w = 'w'
+
+x = [1, 0, 3, "sdf\{d}", 0xFF, 0o77, 0b10_1, 100_100]
+
+f : Int -> Int
+f = if x > 0 then x else 0 () SS `elem` S $ do
+  x <- a [1, 2, 3]
+  let ukuk = akak
+  rewrite $ Wow Wow Wow Wow.Wow b W (W)
+  pure $ f A B c D (EE) E
+
+(&&&) : Nat -> Nat -> Nat
+z &&& y = d + ?foo
+(&&&) x y = ?asfda
+
+public export covering
+(.fun) : X a Y b => Nat -> Nat
+Z .fun = haha.fun haha .N
+(.fun) Z = ahah $ \case
+  x@(x, y) => Prelude.Types.ahahah
+
+(.N) : Nat -> Nat
+Z .N = Z
+(.N) (S n) = (.N) n
+
+xx : Name
+xx = `{Full.Name}
+
+infixr 0 ^^^, &&&
+
+xxx : ?
+xxx = case x of
+  Z => lalalaCamelCase
+  z => alalalCamelCase
+
+ff : Nat -> TTImp
+ff 0 = let x = 0 in val
+ff _ = `(let x = 0 in ~val ^~^ ~(abc))
+ff _ = f `(let x = 0 in ~val ^~^ ~(abc)) x
+
+%language ElabReflection
+%runElab X.sf ads
+
+%macro %inline
+fff : List Decl
+fff = `[
+  f : Nat -> Nat
+
+  f Z = haha %runElab %search @{%World}
+]
+
+private infixr 4 ^--^
+
+(^--^) : Nat -> Nat -> Nat
+(^--^) Z Z = Z
+x ^--^ y = x + y
+
+x : (y : Vect n (Maybe (Maybe (&&&) Nat))) ->
+    {x : Nat} -> {auto _ : Monoid a} ->
+    {default 4 xx : Nat} ->
+    {default (f x Y) xx' : Nat} ->
+    String
+x Z S = ?foo
+x y _ = "a b \{show $ let x = 0 in y} y >>= z"
+
+multiline : String
+multiline = """
+  A multiline string\NUL
+  """
+
+f' : Nat -> Nat
+f' = x' 4
+
+x : Char
+x = '\BEL'
+x = '\\'
+x = '\''
+x = '\o755'
+x = 'a'
+
+xx : Int
+xx = 0o7_5_5