Added the keywards and types t#01

tests/test_keywards.alpha

@@ -0,0 +1,29 @@
+while
+While
+whiLe
+if
+IF
+If
+iF
+then
+Then
+theN
+else
+eLse
+elSe
+Else
+type
+Type
+tyPe
+function
+Function
+functioN
+return
+Return
+returN
+external
+External
+exteRnal
+as
+As
+aS

tests/test_types.alpha

@@ -0,0 +1,10 @@
+integer
+Integer
+address
+Address
+Boolean
+boolean
+character
+Character
+string
+String