docs: rewrite README to document all features added since initial release

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

README.md

@@ -1,16 +1,102 @@
 # H7CAD
 
-<img width="1920" height="940" alt="resim" src="https://github.com/user-attachments/assets/e80191a4-d14c-4b3e-ae72-3b1a7c0be418" />
+<img width="1920" height="940" alt="H7CAD screenshot" src="https://github.com/user-attachments/assets/e80191a4-d14c-4b3e-ae72-3b1a7c0be418" />
 
-A CAD application for 2D/3D drawing and design, built with Rust.
+A CAD application for 2D drafting and 3D modeling, built with Rust. Reads and writes DWG and DXF files natively.
 
 ## Features
 
-- 2D drafting and 3D modeling
+### File Formats
-- DXF file import/export
+- **DWG** read/write (R13 through R2018)
-- GPU-accelerated rendering via WebGPU
+- **DXF** read/write (R13 through R2018)
-- Snap and annotation tools
+- **STL** export (`STLOUT` / `EXPORTSTL`)
-- Modular ribbon interface (Home, Annotate, Insert, View, Manage)
+- **STEP AP203** export (`STEPOUT`)
+- **OBJ** import (`IMPORTOBJ`)
+- **PDF** export (plot layouts to PDF)
+- **WBLOCK** — write selected entities or a block to an external file
+- **XREF** — attach, reload, and auto-resolve external references
+
+### 2D Drafting
+| Command | Description |
+|---------|-------------|
+| `LINE`, `PLINE`, `RECTANG`, `POLYGON` | Basic geometry |
+| `CIRCLE`, `ARC`, `ELLIPSE`, `SPLINE` | Curves |
+| `HATCH`, `HATCHEDIT` | Hatch fills with pattern, scale, angle editing |
+| `OFFSET`, `TRIM`, `EXTEND`, `FILLET` | Modify geometry (supports lines, arcs, ellipses, polylines, splines) |
+| `BREAK`, `STRETCH`, `LENGTHEN` | Shape editing |
+| `ARRAY`, `MIRROR`, `MOVE`, `COPY`, `ROTATE`, `SCALE` | Transformations |
+| `EXPLODE` | Explode blocks, dimensions, polylines, mlines |
+| `DDEDIT` | Double-click text editing |
+| `MASSPROP` | Area, perimeter, centroid of selected entities |
+
+### 3D Modeling
+| Command | Description |
+|---------|-------------|
+| `BOX`, `SPHERE`, `CYLINDER` | Solid primitives |
+| `EXTRUDE`, `REVOLVE` | Profile-based solids |
+| `LOFT` | Ruled-surface loft through cross-sections |
+| `SWEEP` | Sweep a profile along a path |
+| `ARRAY3D` | 3D array |
+| ACIS tessellation | Renders `3DSOLID`, `REGION`, and `BODY` entities |
+
+### Annotations & Dimensions
+- **Dimensions**: Linear, Aligned, Angular, Radial, Diameter, Ordinate — with full `DIMSTYLE` support (`DIMASZ`, `DIMSCALE`, `DIMEXO`, `DIMEXE`, and more)
+- **Text**: `MTEXT`, `TEXT`, `DTEXT` with font browser (`STYLE DIALOG`)
+- **Leaders**: `MLEADER` with straight and spline path types; `MLEADERSTYLE` manager
+- **Tolerances**: GD&T feature control frames
+- **Tables**: `TABLE` entity render; `TABLESTYLE` manager
+- **MLine**: `MLINE` entity with `MLSTYLE` manager and `EXPLODE` support
+
+### Paper Space & Layouts
+- Multi-tab layout system with model space and unlimited paper space tabs
+- **Viewport projection**: Model content correctly projected into paper-space viewport rectangles
+- **Camera persistence**: View position and zoom saved per layout; restored on file open and tab switch
+- **Correct paper size**: Physical paper dimensions read from embedded PlotSettings (not drawing limits)
+- Inline MSPACE overlay — enter a viewport with double-click; edit model entities in place
+- `VPORTS` — preset viewport configurations (single, 2H, 2V, 4-way)
+- `LAYOUTMANAGER` / `LAYOUTPANEL` — GUI layout manager
+- `PLOTSTYLEPANEL` / `STYLESMANAGER` — plot style table editor (CTB/STB)
+- `PRINT` — send layout to system printer
+
+### Blocks & References
+- `INSERT` with attribute prompting (`ATTREQ`)
+- `ATTEDIT` — edit block attribute values interactively
+- `REFEDIT` / `REFCLOSE` — in-place block reference editing
+- `XREF` — attach, reload, and resolve external DWG/DXF references
+- `DATAEXTRACTION` — export entity property data to CSV
+
+### Snapping & Precision
+- Object snaps: Endpoint, Midpoint, Center, Node, Quadrant, Intersection, Perpendicular, Tangent, Nearest, Insertion, and more
+- Ellipse arc endpoints, LWPolyline arc midpoints, Hatch boundary points
+- **Object Snap Tracking** (`OTRACK` / `F11`)
+- **Polar Tracking** with configurable angle increment
+- **Dynamic Input** overlay (`DYNMODE` / `F12`)
+- Grid snap with adaptive spacing
+- Command history navigation (↑ / ↓)
+
+### Rendering
+- GPU-accelerated via WebGPU (wgpu)
+- 4× MSAA anti-aliasing
+- Orthographic and perspective camera
+- ViewCube with face/edge/corner snapping
+- **Wide polylines**: LWPolyline and Polyline2D filled strokes
+- **Raster images**: GPU-textured quad pipeline (`IMAGE` command)
+- **Wipeout**: Solid fill masking
+- **Complex linetypes**: Text and shape elements rendered in linetype patterns
+- White/black entity colors adapt to background luminance
+- Per-viewport background color (`BACKGROUND`)
+- Visual style selector (Wireframe, Shaded, etc.)
+- X-ray ghost pass for selected wires occluded by geometry
+
+### UI
+- Modular ribbon interface — Home, Insert, Annotate, View, Manage, Layout
+- Command line with autocomplete and history
+- Layer Manager with per-viewport freeze columns
+- Properties panel
+- `COLORSCHEME` — runtime theme switching
+- `SHORTCUTS` — keyboard shortcuts panel
+- `SPLINEDIT` — close, open, reverse spline control points
+- UCS icon with 3D foreshortening and axis labels
 
 ## Installation
 
@@ -24,6 +110,10 @@ flatpak install H7CAD.flatpak
 flatpak run io.github.HakanSeven12.H7CAD
 ```
 
+### Windows
+
+Download `H7CAD.exe` from the [latest release](https://github.com/HakanSeven12/H7CAD/releases/latest) and run it directly.
+
 ### Build from Source
 
 Requirements: Rust 1.75+
@@ -31,7 +121,7 @@ Requirements: Rust 1.75+
 ```bash
 git clone https://github.com/HakanSeven12/H7CAD.git
 cd H7CAD
-cargo build --release
+cargo build --release --bin H7CAD
 ./target/release/H7CAD
 ```