chore: add gitattributes, rename guide, and template comments

Add .gitattributes enforcing LF line endings.

Add a rename guide to README.md for scaffolding new projects.

Comment main.c as a template placeholder to replace.

.gitattributes

@@ -0,0 +1 @@
+* text=auto eol=lf

README.md

@@ -88,7 +88,21 @@ Linux / macOS:
 ./build/main
 ```
 
-## Adding a new module (TDD workflow)
+## Renaming the Project
+
+To use this template for a new project, rename `ctdd` to your project
+name:
+
+1. Rename the `ctdd/` directory to `<src>/`.
+2. Replace `ctdd` with `<src>` in:
+   - `CMakeLists.txt` (project name, `target_link_libraries`)
+   - `ctdd/CMakeLists.txt` (library names)
+   - All source `#include` directives
+   - `tests/CMakeLists.txt` (library references)
+3. Update the `project()` call in `CMakeLists.txt`.
+4. Update `main.c` to include your new headers.
+
+Example: `ctdd/` becomes `mylib/`, `ctdd_str` becomes `mylib_str`.
 
 ### 1. Write the header
 

main.c

@@ -1,3 +1,6 @@
+// Template placeholder — replace with your own entry point.
+// Remove or rename this file when scaffolding a new project.
+
 #include "ctdd/str.h"
 #include "ctdd/report.h"
 #include "ctdd/logger.h"