fix: add the removed README

lib/develop/codewalker/README.md

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+# CodeWalker Module
+
+The CodeWalker module provides functionality to walk through directories and create a map of files with their content. It's particularly useful for processing code directories while respecting gitignore patterns.
+
+## Features
+
+- Walk through directories recursively
+- Respect gitignore patterns to exclude files
+- Store file content in memory
+- Export files back to a directory structure
+
+## Usage
+
+```v
+import freeflowuniverse.herolib.lib.lang.codewalker
+
+mut cw := codewalker.new('/tmp/adir')!
+
+// Get content of a specific file
+content := cw.filemap.get('path/to/file.txt')!
+
+// return output again
+cw.filemap.content()
+
+// Export all files to a destination directory
+cw.filemap.export('/tmp/exported_files')!
+
+```
+
+### format of filemap
+
+## full files
+
+```
+
+text before will be ignored
+
+===FILE:filename===
+code
+===FILE:filename===
+code
+===END===
+
+text behind will be ignored
+
+```
+
+## files with changes
+
+```
+
+text before will be ignored
+
+===FILECHANGE:filename===
+code
+===FILECHANGE:filename===
+code
+===END===
+
+text behind will be ignored
+
+```
+
+FILECHANGE and FILE can be mixed, in FILE it means we have full content otherwise only changed content e.g. a method or s struct and then we need to use morph to change it