Add syntax mapping from NSE to Lua (#2214)

tests/syntax-tests/source/NSE/test.nse

@@ -0,0 +1,34 @@
+--- Finds factorial of a number.
+-- @param value Number to find factorial.
+-- @return Factorial of number.
+local function factorial(value)
+    if value <= 1 then
+        return 1
+    else
+        return value * factorial(value - 1)
+    end
+end
+
+--- Joins a table of strings into a new string.
+-- @param table Table of strings.
+-- @param separator Separator character.
+-- @return Joined string.
+local function join(table, separator)
+    local data = ""
+    
+    for index, value in ipairs(table) do
+        data = data .. value .. separator
+    end
+    
+    data = data:sub(1, data:len() - 1)
+    
+    return data
+end
+
+local a = factorial(5)
+
+print(a)
+
+local b = join({ "l", "u", "a" }, ",")
+
+print(b)