chore(docs): add repo layout diagram (#299)

* Update README.md

* Update README.md

Author: reecepbcups

README.md

@@ -91,3 +91,97 @@ In this 4 minute demo we:
 [Follow Along with the nameservice demo in the docs](https://rollchains.github.io/spawn/v0.50/build/name-service/) | [source](./docs/versioned_docs/version-v0.50.x/02-build-your-application/01-nameservice.md)
 
 https://github.com/rollchains/spawn/assets/31943163/ecc21ce4-c42c-4ff2-8e73-897c0ede27f0
+
+## Repo Layout
+
+<!-- Generated with https://gitdiagram.com/rollchains/spawn -->
+```mermaid
+graph TD
+    %% CLI Interface Layer
+    subgraph "CLI Interface Layer"
+        A1("Main Entry (main.go)"):::cli
+        A2("CLI Commands (cli.go)"):::cli
+        A3("New Chain Command (new_chain.go)"):::cli
+        A4("UI Components (ui.go)"):::cli
+        A5("CLI Plugins (plugins.go)"):::cli
+    end
+
+    %% Core Spawn Engine
+    subgraph "Core Spawn Engine"
+        B1("Configuration Management (cfg.go, cfg_builder.go)"):::core
+        B2("Command Parsing (parser.go)"):::core
+        B3("Command Execution (command.go)"):::core
+        B4("Plugin Integration"):::core
+    end
+
+    %% Plugins and Extensibility
+    subgraph "Plugins and Extensibility"
+        E1("Plugins (plugins)"):::plugin
+    end
+
+    %% SimApp (Example Blockchain Application)
+    subgraph "SimApp (Example Blockchain)"
+        C1("Application Logic (simapp/app)"):::chain
+        C2("API/gRPC Interfaces (simapp/api)"):::chain
+        C3("Blockchain Modules (simapp/x)"):::chain
+    end
+
+    %% CI/CD and Automation
+    subgraph "CI/CD and Automation"
+        D1("GitHub Actions (.github/workflows)"):::automation
+        D2("Docker Configuration (Dockerfile)"):::automation
+        D3("Build Scripts (Makefile)"):::automation
+    end
+
+    %% Relationships from CLI to Core Spawn Engine
+    A1 -->|"initiate"| B1
+    A2 -->|"parse_commands"| B2
+    A3 -->|"execute_chain"| B3
+    A4 -->|"trigger_UI"| B3
+    A5 -->|"load_plugins"| B4
+
+    %% Relationship from Core to Plugins
+    B4 -->|"integrate_plugin"| E1
+
+    %% Relationships from Core Spawn Engine to SimApp
+    B3 -->|"scaffold_chain"| C1
+    B3 -->|"expose_API"| C2
+    B3 -->|"load_modules"| C3
+
+    %% CI/CD automation triggers to SimApp
+    D1 -->|"trigger_test_build"| C1
+    D2 -->|"containerize"| C1
+    D3 -->|"build_project"| C1
+
+    %% Click Events for CLI Layer
+    click A1 "https://github.com/rollchains/spawn/blob/release/v0.50/cmd/spawn/main.go"
+    click A2 "https://github.com/rollchains/spawn/blob/release/v0.50/cmd/spawn/cli.go"
+    click A3 "https://github.com/rollchains/spawn/blob/release/v0.50/cmd/spawn/new_chain.go"
+    click A4 "https://github.com/rollchains/spawn/blob/release/v0.50/cmd/spawn/ui.go"
+    click A5 "https://github.com/rollchains/spawn/blob/release/v0.50/cmd/spawn/plugins.go"
+
+    %% Click Events for Core Spawn Engine
+    click B1 "https://github.com/rollchains/spawn/blob/release/v0.50/spawn/cfg.go"
+    click B2 "https://github.com/rollchains/spawn/blob/release/v0.50/spawn/parser.go"
+    click B3 "https://github.com/rollchains/spawn/blob/release/v0.50/spawn/command.go"
+
+    %% Click Events for SimApp
+    click C1 "https://github.com/rollchains/spawn/tree/release/v0.50/simapp/app"
+    click C2 "https://github.com/rollchains/spawn/tree/release/v0.50/simapp/api"
+    click C3 "https://github.com/rollchains/spawn/tree/release/v0.50/simapp/x"
+
+    %% Click Event for Plugins
+    click E1 "https://github.com/rollchains/spawn/tree/release/v0.50/plugins"
+
+    %% Click Events for CI/CD and Automation
+    click D1 "https://github.com/rollchains/spawn/tree/release/v0.50/.github/workflows"
+    click D2 "https://github.com/rollchains/spawn/tree/release/v0.50/Dockerfile"
+    click D3 "https://github.com/rollchains/spawn/tree/release/v0.50/Makefile"
+
+    %% Styles
+    classDef cli fill:#f9e79f,stroke:#b9770e,stroke-width:2px;
+    classDef core fill:#aed6f1,stroke:#2471a3,stroke-width:2px;
+    classDef chain fill:#d5f5e3,stroke:#1e8449,stroke-width:2px;
+    classDef plugin fill:#f5b7b1,stroke:#c0392b,stroke-width:2px;
+    classDef automation fill:#d7bde2,stroke:#8e44ad,stroke-width:2px;
+```