Updating ContentView with the tutorial. Updating README.md adding tips.

README.md

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+# Landmarks
+
+Coming from the official Apple tutorial that can be found here : 
+https://developer.apple.com/tutorials/swiftui/
+
+The goal of this repository is to help students beginning in iOS development.
+In the **Tips** section, I'll add some novelty for Xcode 26 that might not apply to old Xcode version.
+
+## Tips
+
+### Section 2 - Step 2
+
+Command + Control + Click : Only show the command **Embed...**  
+Sadly, we can't see the option **"Show SwiftUI Inspector"** alongside the other options.  
+It's not a problem since we can add the necessary modifications directly using the text editor.
+
+### Section 2 - Step 6
+
+Same thing is happening than the previous step.  
+Control + Click : This time, more options are available but **"Show SwiftUI Inspector"** isn't here.
+It's not a problem since we can add the necessary modifications directly using the text editor.
+
+### Section 3 - Step 1
+
+The option **"Embed in VStack"** doesn't exist anymore. The only option is **"Embed..."**.  
+Again, it's not a problem. We can write **VStack** after selecting this option, instead of **Container**.
+
+### Section 3 - Step 2
+
+The plus button (+) at the top-right of the Xcode window, doesn't open anymore the Library panel.
+
+Two options remains through : 
+1. The shortcut : CMD + SHIFT + L 
+2. The menu : View > Show Library