Height Chart admin

I need someone to create a simple web app that will allow the following process: * Invite logon, and check password (only one user, password not changeable) * Read the contents of a text file and present the information in a form * Allow the user to change the contents of two form fields * On submission, write the contents of the form to the text file in a specific url-encoded fashion I can provide all (X)HTML and CSS code needed for the project. The server environment is .NET, so the project could be done in any .NET compatable language.