Added localized dockerized build instructions with documentation

DOCKER.md

@@ -0,0 +1,27 @@
+# Docker Usage Instructions
+
+## Building and Running
+
+1. Build the container:
+```bash
+docker-compose build
+```
+
+2. Start a shell session:
+```bash
+docker-compose run --rm repo-to-text
+```
+
+Once in the shell, you can run repo-to-text:
+```bash
+# Process current directory
+repo-to-text
+
+# Process specific directory
+repo-to-text /home/user/myproject
+
+# Use with options
+repo-to-text --output-dir /home/user/output
+```
+
+The container mounts your home directory at `/home/user`, allowing access to all your projects.