update README.md

Author: gordienkoas

README.md

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+##  Page Analyzer. Hexlet.io School's third project.
+
+Page Analyzer is a Flask web application that allows users to analyze web pages for SEO effectiveness. The application checks the availability of websites and analyzes elements such as headers, descriptions, and H1 tags.
+
+## Features
+
+- URL availability check.
+- Analysis of title and description tags.
+- Display of check results on the user interface.
+
+## Demo
+
+You can view the application in action at this link:
+[python-project-83-i26e.onrender.com]https://python-project-83-i26e.onrender.com
+
+## Technologies
+
+- Python
+- Flask
+- PostgreSQL
+- HTML/CSS
+- Bootstrap for frontend
+- Poetry for dependency management
+
+## Getting Started
+
+These instructions will get you a copy of the project up and running on your local machine for development and testing purposes.
+
+### Prerequisites
+
+Ensure you have Python, Poetry, and PostgreSQL installed.
+
+### Installation and Running
+
+Use the `Makefile` to simplify the installation and startup process:
+
+```bash
+git clone https://github.com/gordienkoas/python-project-83
+cd python-project-83
+
+## Configuration
+Before running the application, make sure your environment variables are set up correctly. Check the .env file and ensure that it contains valid values for the following variables:
+SECRET_KEY: A secret key for your application.
+DATABASE_URL: The connection string for your PostgreSQL database, formatted as postgresql://username:password@localhost:5432/database_name.
+
+# Install dependencies
+make install
+
+# Run the local development server
+make dev
+
+# Run the production server
+make start
+```
+
+### Testing
+
+To run tests, use the following command:
+
+```bash
+make lint  # Code linting
+```