add mvc notes

Author: gambitier

session 5/chapters/4. Authentication.md

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+# Authentication
+
+![auth](../../session%205/images/auth.jpg)
+
+## Different ways for authentication
+
+1. Basic
+   1. username and password
+   2. mobile number and OTP
+   3. email and password
+2. JWT
+   1. It's a short for JSON Web Token
+   2. JSON Web Token is a proposed Internet standard for creating data with optional signature and/or optional encryption whose payload holds JSON that asserts some number of claims.
+   3. The tokens are signed either using a private secret or a public/private key.
+   4. [What Is JWT and Why Should You Use JWT](https://www.youtube.com/watch?v=7Q17ubqLfaM)
+   5. https://jwt.io/
+3. OAuth 2
+   1. [ref](https://www.digitalocean.com/community/tutorials/an-introduction-to-oauth-2)
+
+# Authorization
+
+![authorization](../images/authorization.jpg)
+
+## Common Authorization Methods
+
+![common authr methods](../../session%205/images/auth%20methods.jpg)

session 5/chapters/5. Request Processing Flow.md

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+# MVC
+
+MVC (Model-View-Controller) is a pattern in software design commonly used to implement user interfaces, data, and controlling logic. It emphasizes a separation between the software's business logic and display.
+
+![mvc](../images/MVC.jpg)
+
+## Model
+
+The Model component corresponds to all the data-related logic that the user works with. This can represent either the data that is being transferred between the View and Controller components or any other business logic-related data. For example, a Customer object will retrieve the customer information from the database, manipulate it and update it data back to the database or use it to render data.
+
+## View
+
+The View component is used for all the UI logic of the application. For example, the Customer view will include all the UI components such as text boxes, dropdowns, etc. that the final user interacts with.
+
+## Controller
+
+Controllers act as an interface between Model and View components to process all the business logic and incoming requests, manipulate data using the Model component and interact with the Views to render the final output. For example, the Customer controller will handle all the interactions and inputs from the Customer View and update the database using the Customer Model. The same controller will be used to view the Customer data.
+
+# Request proceesing flow
+
+![flow](../../session%205/images/request%20processing%20flow.jpg)

session 5/chapters/resources.md

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+[auth vs authorization](https://www.okta.com/identity-101/authentication-vs-authorization/)