Improving CLI tool and improving documentation

examples/README.md

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+# Examples
+
+This directory contains example projects demonstrating different features and usage patterns of `mdt`.
+
+## Directory Structure
+
+```
+examples/
+  simple/           # A basic, single-file application
+  complex/          # A multi-file project with custom schema
+  README.md         # This file
+```
+
+## Running Examples
+
+Prerequisite: `mdt` must be built (or installed). The Makefiles in the examples assume `mdt` is available at `../../build/mdt`.
+
+### Simple Project
+
+Demonstrates a minimal setup:
+- Single `main.marte` file.
+- Basic Thread and GAM definition.
+
+**Run:**
+```bash
+cd simple
+make check
+make build
+```
+
+### Complex Project
+
+Demonstrates advanced features:
+- **Multi-file Structure**: `src/app.marte` (Logic) and `src/components.marte` (Data).
+- **Namespaces**: Use of `#package` to organize nodes.
+- **Custom Schema**: `.marte_schema.cue` defines a custom class (`CustomController`) with specific metadata (`#meta.multithreaded`).
+- **Validation**: Enforces strict typing and custom rules.
+
+**Run:**
+```bash
+cd complex
+make check
+make build
+```