added lessons!

lessons.lua

@@ -0,0 +1,30 @@
+-- Source https://stackoverflow.com/a/11130774
+function scandir(directory)
+    local directory = directory or ""
+		local i, t, popen = 0, {}, io.popen
+		local pfile = popen('ls "'..directory..'"')
+		for filename in pfile:lines() do
+				i = i + 1
+				t[i] = filename
+		end
+		pfile:close()
+		return t
+end
+
+function getFormattedLessonNames(directory)
+    local t = scandir(directory)
+    for i=1, #t do
+				t[i] = colorTextBackground(COLOR.Black,"\n#" .. i .. " " .. colorText(COLOR.HighBlue,string.gsub(t[i],".lua","")))
+    end
+		return t
+end
+
+function lesson(number)
+  number = tonumber(number)
+  local t = scandir(dir.."/lessons/")
+  if t[number] then
+    dofile("lessons/"..t[number])
+  else
+    print("lesson not found")
+  end
+end