docs: Remove performance section and add placeholders for images

Author: Nonanti

README.md

@@ -4,6 +4,9 @@
 [![.NET](https://img.shields.io/badge/.NET-9.0-512BD4)](https://dotnet.microsoft.com)
 [![License](https://img.shields.io/badge/license-MIT-blue)](LICENSE)
 
+<!-- BURAYA BANNER/LOGO GÖRSELİ KOYABİLİRSİN -->
+<!-- ![CodeContext.NET Banner](./assets/banner.png) -->
+
 Ever spent hours explaining your codebase patterns to ChatGPT? Or wished GitHub Copilot understood your team's coding style? **CodeContext.NET** solves that.
 
 ## What It Does
@@ -18,6 +21,9 @@ That's it. You get a context file ready to paste into any AI chat.
 
 ## Real Example
 
+<!-- BURAYA DEMO GIF KOYABİLİRSİN - Tool'un çalışmasını gösteren -->
+<!-- ![Demo](./assets/demo.gif) -->
+
 Let's say you have this in your codebase:
 
 ```csharp
@@ -57,6 +63,9 @@ You'll get something like:
 
 ## The Output
 
+<!-- BURAYA OUTPUT SCREENSHOT KOYABİLİRSİN - Markdown/JSON çıktısının ekran görüntüsü -->
+<!-- ![Output Example](./assets/output-example.png) -->
+
 Here's what you actually get:
 
 ```markdown
@@ -79,15 +88,6 @@ codecontext -f json             # want JSON instead
 codecontext -v                  # see what it's doing
 ```
 
-## Performance
-
-Fast enough that you won't grab coffee:
-- Small project (10 files): ~1 second
-- Medium project (500 files): ~3 seconds
-- Large project (10,000 files): ~10 seconds
-
-It runs parallel analysis on all your CPU cores.
-
 ## Building From Source
 
 Standard .NET stuff: