readme file and help message added

README.md

@@ -0,0 +1,10 @@
+# PASSWORD GENERATOR
+
+```sh
+pwdgen -h
+    pwdgen <quantity> - generates a password of the given size from the standard alphabet          
+    pwdgen <alphabet> - generates four characters from the given alphabet  
+    pwdgen <alphabet> <quantity> - generates a password of the given length from the given alphabet
+    pwdgen - generates a four character password from the standard alphabet
+
+```