Create diagram.md

docs/diagram.md

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+```mermaid
+flowchart TB
+    %% Styles
+    classDef api fill:#3498db,stroke:#2980b9,color:white
+    classDef core fill:#2ecc71,stroke:#27ae60,color:white
+    classDef integration fill:#f1c40f,stroke:#f39c12,color:black
+    classDef critical fill:#e74c3c,stroke:#c0392b,color:white
+    classDef default fill:#95a5a6,stroke:#7f8c8d,color:white
+
+    %% Application Layer
+    subgraph AppLayer["Application Layer"]
+        ExtApp["External Erlang Applications"]
+    end
+
+    %% Public Interface Layer
+    subgraph PublicAPI["Public Interface"]
+        MeckAPI["Meck API (meck)"]:::api
+    end
+
+    %% Core Services Layer
+    subgraph CoreServices["Core Services Layer"]
+        CodeGen["Code Generation System (meck_code_gen)"]:::core
+        Expect["Expectation Handler (meck_expect)"]:::core
+        History["History Tracker (meck_history)"]:::core
+        ProcMgr["Process Manager (meck_proc)"]:::critical
+        ArgMatch["Argument Matcher (meck_args_matcher)"]:::core
+        RetSpec["Return Spec Handler (meck_ret_spec)"]:::core
+        Util["Utility Functions (meck_util)"]:::core
+        Matcher["Matcher Implementation (meck_matcher)"]:::core
+        Defs["Shared Definitions (meck.hrl)"]:::core
+    end
+
+    %% Integration Layer
+    subgraph Integration["Integration Layer"]
+        OrigMod["Original Module Interface (meck_code)"]:::integration
+        Cover["Cover Tool Integration (meck_cover)"]:::integration
+    end
+
+    %% Relationships
+    ExtApp --> MeckAPI
+    MeckAPI --> CodeGen
+    MeckAPI --> Expect
+    MeckAPI --> History
+    MeckAPI --> ProcMgr
+    
+    CodeGen --> OrigMod
+    CodeGen --> Cover
+    
+    Expect --> ArgMatch
+    Expect --> RetSpec
+    Expect --> History
+    
+    ProcMgr --> CodeGen
+    ProcMgr --> History
+    
+    ArgMatch --> Matcher
+    
+    %% Shared Dependencies
+    CodeGen -.-> Defs
+    Expect -.-> Defs
+    History -.-> Defs
+    ProcMgr -.-> Defs
+    
+    CodeGen -.-> Util
+    Expect -.-> Util
+    History -.-> Util
+    ProcMgr -.-> Util
+
+    %% Click Events
+    click MeckAPI "https://github.com/eproxus/meck/blob/master/src/meck.erl"
+    click CodeGen "https://github.com/eproxus/meck/blob/master/src/meck_code_gen.erl"
+    click Expect "https://github.com/eproxus/meck/blob/master/src/meck_expect.erl"
+    click History "https://github.com/eproxus/meck/blob/master/src/meck_history.erl"
+    click ProcMgr "https://github.com/eproxus/meck/blob/master/src/meck_proc.erl"
+    click ArgMatch "https://github.com/eproxus/meck/blob/master/src/meck_args_matcher.erl"
+    click RetSpec "https://github.com/eproxus/meck/blob/master/src/meck_ret_spec.erl"
+    click Cover "https://github.com/eproxus/meck/blob/master/src/meck_cover.erl"
+    click OrigMod "https://github.com/eproxus/meck/blob/master/src/meck_code.erl"
+    click Defs "https://github.com/eproxus/meck/blob/master/src/meck.hrl"
+    click Util "https://github.com/eproxus/meck/blob/master/src/meck_util.erl"
+    click Matcher "https://github.com/eproxus/meck/blob/master/src/meck_matcher.erl"
+```