feature: Add TUI's basic setting

tui.py

@@ -0,0 +1,59 @@
+import npyscreen
+import curses
+
+class MyTestApp(npyscreen.NPSAppManaged):
+    def onStart(self):
+        self.addForm("MAIN", MainForm, name="Google Translator - TUI")
+
+class TestBox(npyscreen.BoxTitle):
+    _contained_widget = npyscreen.Textfield
+
+class MainForm(npyscreen.FormBaseNew):
+    def create(self):
+        # set event handler
+        event_handlers = {
+            # ALT + ENTER -> send request
+            curses.ascii.alt(curses.ascii.NL): self.send_text
+        }
+        self.add_handlers(event_handlers)
+
+        # get terminal's size
+        y, x = self.useable_space()
+
+        self.input = self.add(TestBox, name="Input (from)", footer="Footer", 
+            max_width=x//2-3, max_height=y-5, relx=3, rely=3, value="{} {}".format(x, y))
+        
+        self.output = self.add(TestBox, name="Output (to)", footer="Footer",
+            max_width=x//2-3, max_height=y-5, relx=x//2+1, rely=3, editable=False)
+    
+    def resize(self):
+        '''
+            resize the form when the terminal is resizing
+            This function will be called by npyscreen automatically.
+        '''
+        # get terminal's size
+        y, x = self.useable_space()
+
+        # change input's size
+        self.input.max_width = x//2-3
+        self.input.max_height = y//2
+
+        # change output's size & location
+        self.output.max_width = x//2-3
+        self.output.max_height = y//2
+        self.output.relx = x//2+1  # location(x)
+
+        # Output's contained widget, TextField must be move to a new position
+        self.output.entry_widget.relx = x//2+2
+    
+    def send_text(self, event):
+        # When press ALT + ENTER, send request & update output's text
+        self.output.entry_widget.value = self.input.value
+        self.output.entry_widget.display()
+
+def main():
+    TA = MyTestApp()
+    TA.run()
+
+if __name__ == '__main__':
+    main()