input: Write a function to create a web application in Python using Flask that will take user input and generate an HTML page with the input. The function should return the Flask instance and a string containing the content of the `result.html` file.
  assert create_web_app()==(Flask(__name__), '<html>\n <body>\n  <h1>Your Input: </h1>\n  <p>{{input_text}}</p>\n </body>\n</html>')
  assert create_web_app().__class__==Flask
output: def create_web_app():
      from flask import Flask, render_template_string
      app = Flask(__name__)
      html_content = '''<html>
   <body>
    <h1>Your Input: </h1>
    <p>{{input_text}}</p>
   </body>
  </html>'''
      return app, html_content