feat: added README.md

README.md

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+# Postman-to-PDF|HTML exporter (Node.js)
+
+## List of contents
+- [Technologies used](#technologies-and-software-used)
+- [List of libraries used](#list-of-libraries-used)
+- [How to use](#how-to-use)
+
+## Technologies used
+| Technology name | Link |
+|-----------------|------|
+| Node.js |[Website](https://nodejs.org/)|
+
+## List of libraries used
+| Library name | Purpose | Link |
+|--------------|---------|------|
+| html-pdf |for convert html to pdf|[Website](https://www.npmjs.com/package/html-pdf)|
+
+# How to use
+
+## List of contents
+- [Run application](#run-application)
+- [Additionally](#additionally)
+
+## Run application
+1. Run the command:
+```bash
+npm i
+```
+to set dependencies;
+3. Do an export of the collection from Postman;
+4. Specify values to variables in app.js;
+5. Execute the command:
+```bash
+npm run start
+```
+to run the application.
+
+## Additionally
+1. Application replaces the Postman environment variable {{api_url}} - to the value of the apiRoute variable;
+2. It's important to have subscopes in the scopes and no scope requests if there's a sabscope;
+3. If there is a public, user or admin scope, it supplements the request tokens with an authorization token (mandatory or optional).