Add Crystal language support

test/resources/repos/crystal/test_repo/shard.yml

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+name: test_repo
+version: 0.1.0
+
+targets:
+  test_repo:
+    main: src/main.cr
+
+crystal: ">= 1.0.0"

test/resources/repos/crystal/test_repo/src/main.cr

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+require "./utils"
+
+class Calculator
+  def add(a : Int32, b : Int32) : Int32
+    a + b
+  end
+
+  def multiply(a : Int32, b : Int32) : Int32
+    a * b
+  end
+end
+
+struct User
+  getter name : String
+  getter age : Int32
+
+  def initialize(@name : String, @age : Int32)
+  end
+
+  def greet : String
+    "Hello, my name is #{name} and I am #{age} years old."
+  end
+
+  def adult? : Bool
+    age >= 18
+  end
+end
+
+module Status
+  Active   = 0
+  Inactive = 1
+  Pending  = 2
+end
+
+calculator = Calculator.new
+result = calculator.add(5, 3)
+puts "Result: #{result}"
+
+user = User.new("Alice", 30)
+puts user.greet
+
+area = Utils.calculate_area(5.0)
+puts "Circle area: #{area}"

test/resources/repos/crystal/test_repo/src/utils.cr

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+module Utils
+  def self.format_date(time : Time) : String
+    time.to_s("%Y-%m-%d")
+  end
+
+  def self.calculate_area(radius : Float64) : Float64
+    Math::PI * radius * radius
+  end
+end