Add basic var tokens

specs/VARIABLES.md

@@ -0,0 +1,24 @@
+# Variables
+Variables can be defined in the global scope, in structs and classes, and in functions.
+
+## Global variables
+Global variables can be defined as such:
+
+```c2
+// Defines a global variable called my_var.
+int32 my_var;
+
+// Defines a const variable.
+const int32 my_var;
+
+// Defines a global variable whose type is determined automatically.
+// The value will be determined at runtime.
+var my_var = 123;
+
+// Defines a const variable whose type is determined automatically.
+const my_var = 123;
+
+// Defines a global variable whose initial value is computed at compile-time.
+// If it cannot be computed at compile-time, an error is thrown.
+static my_var = 123;
+```