Update README with ED template documentation

Co-authored-by: dwinkler1 <22460147+dwinkler1@users.noreply.github.com>

README.md

@@ -4,9 +4,32 @@ A collection of Nix flake templates for reproducible development environments.
 
 ## Templates
 
+### ED (Editor)
+
+A simple Neovim-based development environment with optional language support.
+
+**Quick start:**
+```bash
+nix flake init -t github:dwinkler1/np#ed
+nix develop
+vv  # Launch Neovim (custom binary name)
+```
+
+**Features:**
+- ✨ Lightweight Neovim configuration
+- 🔧 Configurable language support (Python, R, Julia, Nix)
+- 📦 Reproducible with Nix
+- 🎨 Custom theming (Kanagawa by default)
+- 🔔 Mini-notify plugin for notifications
+
+**Default configuration:**
+- Nix support enabled
+- Custom binary: `vv`
+- Includes: cowsay, updateR utility
+
 ### RDE (Research Development Environment)
 
-The default template for data science and research projects with support for R, Python, and Julia.
+A comprehensive template for data science and research projects with support for R, Python, and Julia.
 
 **Quick start:**
 ```bash
@@ -34,12 +57,63 @@ All templates are automatically tested to ensure functionality:
 
 ### CI Workflows
 
-- `.github/workflows/check.yml` - Comprehensive functionality tests (Ubuntu)
-- `.github/workflows/check_macos.yml` - macOS compatibility tests
+**RDE Template:**
+- `.github/workflows/check.yml` - Comprehensive functionality tests for RDE (Ubuntu)
+  - Basic build and flake checks
+  - Dev shell functionality
+  - R command availability and functionality
+  - Neovim integration
+  - Utility commands (p-initProject, p-updateDeps)
+  - Separate jobs for Python and Julia configurations
+
+**ED Template:**
+- `.github/workflows/check_ed.yml` - Comprehensive functionality tests for ED (Ubuntu)
+  - Basic build and flake checks
+  - Dev shell functionality
+  - Neovim (vv) command tests
+  - updateR utility tests
+  - Extra packages (cowsay) verification
+  - Separate jobs for Python, R, Julia, and multi-language configurations
+
+**Cross-platform:**
+- `.github/workflows/check_macos.yml` - macOS compatibility tests for both templates
 - `.github/workflows/update.yml` - Automated dependency updates
 
 ## Usage
 
+### ED Template
+
+1. **Initialize a new project:**
+   ```bash
+   nix flake init -t github:dwinkler1/np#ed
+   ```
+
+2. **Enter development environment:**
+   ```bash
+   nix develop
+   # or with direnv
+   echo "use flake" > .envrc && direnv allow
+   ```
+
+3. **Start editing:**
+   ```bash
+   vv              # Launch Neovim
+   updateR         # Update R packages (when R is enabled)
+   cowsay "Hello!" # Fun utility included
+   ```
+
+4. **Enable languages:**
+   Edit `flake.nix` and change `false` to `true` in the `cats` section:
+   ```nix
+   cats = {
+     python = true;  # Enable Python support
+     r = true;       # Enable R support
+     julia = true;   # Enable Julia support
+   };
+   ```
+
+### RDE Template
+
 1. **Initialize a new project:**
    ```bash
    nix flake init -t github:dwinkler1/np#rde