Docs(DPxAI): add subject

subjects/DPxAI/first-function/README.md

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+## First Function
+
+> Mindful AI mode
+
+### Context
+
+Your robot will need to start executing custom tasks, and to do that, you'll need to program its `functions`. Functions are like commands that tell robot exactly what to do.
+
+You can create your own functions to give your robot unique abilities and make it more efficient!
+
+### AI-Powered Learning Techniques
+
+`Reflective Practice Technique:`
+This type of prompt encourages learners to reflect on the concepts they’ve just learned, reinforcing their understanding by applying the concepts in different contexts or scenarios.
+
+Find the examples across the subject ;)
+
+### Concepts
+
+Remember this example of function call ?
+
+```js
+//       ↙ identifier, like variables
+console.log("Hello There !"); // <- function call happening here
+//          ↖ open paren + argument + close paren
+```
+
+There, we saw how to call and use "built-in" functions.
+
+Here, now, we are going to learn how to declare our owns. This will gives us even more freedom to build our own logic.
+
+### Declaring a function
+
+Here, we’ll learn how to declare a function in a `variable`. This gives your robot more freedom to perform custom tasks.
+
+We'll use the `ArrowFunctionExpression` syntax to declare a function:
+
+```js
+//    ↙ normal variable     ↙ beginning of the scope of the function
+let myFirstFunction = () => {
+  //                    ↖ parens () for arguments and the arrow => for syntax
+}; // <-end of the scope of the function
+```
+
+### Calling a Function
+
+Once declared, you can call the function using the parentheses `()`:
+
+```js
+myFirstFunction(); // This will call the function, but nothing happens yet
+```
+
+### Adding Instructions
+
+Very much like an if statement a function has a scope. The scope in between the curly braces `{}` is where the action happens. Let's add something to the scope of our function:
+
+```js
+let myFirstFunction = () => {
+  console.log("Robot is now active!");
+};
+```
+
+Now, when you call `myFirstFunction()`, Robot will log a message in the console:
+
+```js
+myFirstFunction(); // Output: "RoboGuard is now active!"
+```
+
+> We actually declared, then called the function and gave it this single instruction, `console.log('Robot is now active!')`.
+
+#### **`Prompt Example`**:
+
+- "How do you call a function in JavaScript, and what happens if the function contains no instructions?"
+
+### Instructions
+
+#### Task 1:
+
+You are a robot made by a scientist called Rick and you want to know your purpose.
+
+- Declare a function named `ask` that `log` 'What is my purpose ?' in the console
+- Declare a function named `reply` that `log` 'You pass butter.' in the console
+  Then first `call the ask` then `the reply` once, in that order.