Add Resources.md page to fix broken reference in Tools.md

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+# Resources
+
+This page provides resources and references for working with Unix command line tools and embedded development.
+
+## Unix Command Line Basics
+
+### Essential Commands
+
+- **`ls`** - List directory contents
+  - `ls -a` - Show all files (including hidden ones)
+  - `ls -l` - Long format listing
+  - `ls -h` - Human-readable file sizes
+  - `ls -la` - Combine flags for detailed listing with hidden files
+
+- **`cd`** - Change directory
+  - `cd ..` - Move to parent directory
+  - `cd ~` - Move to home directory
+  - `cd -` - Move to previous directory
+
+- **`pwd`** - Print working directory (shows current location)
+
+- **`cp`** - Copy files and directories
+  - `cp source destination` - Copy file
+  - `cp -r source destination` - Copy directory recursively
+
+- **`mv`** - Move/rename files and directories
+  - `mv oldname newname` - Rename file
+  - `mv file directory/` - Move file to directory
+
+- **`rm`** - Remove files and directories
+  - `rm file` - Remove file
+  - `rm -r directory` - Remove directory recursively
+  - `rm -f file` - Force remove (no confirmation)
+
+- **`mkdir`** - Create directory
+  - `mkdir -p path/to/dir` - Create parent directories if needed
+
+- **`man`** - Display manual pages
+  - `man command` - Show manual for command
+  - `man -k keyword` - Search manual pages
+
+### File Navigation and Viewing
+
+- **`cat`** - Concatenate and display file contents
+- **`less`** - View file contents with pagination
+- **`head`** - Display first lines of file
+- **`tail`** - Display last lines of file
+- **`grep`** - Search for patterns in files
+  - `grep "pattern" file` - Search for pattern in file
+  - `grep -r "pattern" directory` - Search recursively
+
+### Process Management
+
+- **`ps`** - Show running processes
+- **`top`** - Interactive process viewer
+- **`kill`** - Terminate processes
+- **`jobs`** - List background jobs
+- **`fg`** - Bring job to foreground
+- **`bg`** - Send job to background
+
+### Network and System
+
+- **`ping`** - Test network connectivity
+- **`ssh`** - Secure shell connection
+- **`scp`** - Secure copy over SSH
+- **`wget`** - Download files from web
+- **`curl`** - Transfer data from/to servers
+
+## Git Basics
+
+- **`git status`** - Show repository status and changes
+- **`git add`** - Stage changes for commit
+- **`git commit`** - Commit staged changes
+- **`git push`** - Push commits to remote repository
+- **`git pull`** - Pull changes from remote repository
+- **`git clone`** - Clone repository from remote
+- **`git branch`** - List/create/delete branches
+- **`git checkout`** - Switch branches or restore files
+- **`git log`** - Show commit history
+
+## Text Editors
+
+### Command Line Editors
+
+- **`nano`** - Simple, beginner-friendly editor
+- **`vim`** - Powerful modal editor
+- **`emacs`** - Extensible editor
+
+### VS Code
+
+- **`code .`** - Open current directory in VS Code
+- **`code file`** - Open specific file in VS Code
+
+## Useful Shell Features
+
+### Tab Completion
+Press Tab to auto-complete file names, commands, and paths.
+
+### Command History
+- **`history`** - Show command history
+- **`!n`** - Execute command number n from history
+- **`!!`** - Execute last command
+- **`!$`** - Use last argument of previous command
+
+### Aliases
+Create shortcuts for commonly used commands:
+```bash
+alias ll='ls -la'
+alias ..='cd ..'
+```
+
+### Environment Variables
+- **`echo $VARIABLE`** - Print variable value
+- **`export VARIABLE=value`** - Set environment variable
+- **`env`** - List all environment variables
+
+## File Permissions
+
+- **`chmod`** - Change file permissions
+  - `chmod +x file` - Make file executable
+  - `chmod 755 file` - Set specific permissions
+- **`chown`** - Change file owner
+- **`ls -l`** - View file permissions
+
+## Package Management
+
+### Ubuntu/Debian
+- **`apt update`** - Update package list
+- **`apt install package`** - Install package
+- **`apt upgrade`** - Upgrade installed packages
+
+### macOS (with Homebrew)
+- **`brew install package`** - Install package
+- **`brew update`** - Update Homebrew
+- **`brew upgrade`** - Upgrade installed packages
+
+## Troubleshooting
+
+### Common Issues
+
+1. **Permission Denied**
+   - Use `sudo` for commands requiring root privileges
+   - Check file permissions with `ls -l`
+
+2. **Command Not Found**
+   - Check if command is installed
+   - Verify PATH environment variable
+   - Use `which command` to find command location
+
+3. **File Not Found**
+   - Use `find` to locate files
+   - Check current directory with `pwd`
+   - Use `ls` to verify file exists
+
+### Getting Help
+
+- **`man command`** - Manual pages
+- **`command --help`** - Built-in help
+- **`info command`** - Info pages (if available)
+- **`apropos keyword`** - Search manual pages by keyword
+
+## Additional Resources
+
+- [Linux Command Library](https://linuxcommandlibrary.com/)
+- [Explain Shell](https://explainshell.com/) - Interactive command explanation
+- [Unix/Linux Command Reference](https://ss64.com/bash/)
+- [Bash Reference Manual](https://www.gnu.org/software/bash/manual/)
+- [Advanced Bash-Scripting Guide](https://tldp.org/LDP/abs/html/)
+
+## Embedded Development Resources
+
+- [Raspberry Pi Pico SDK Documentation](https://www.raspberrypi.com/documentation/pico-sdk/)
+- [ARM Cortex-M0+ Technical Reference Manual](https://developer.arm.com/documentation/ddi0484/c/)
+- [Lingua Franca Documentation](https://www.lf-lang.org/docs/handbook/)
+- [CMake Documentation](https://cmake.org/documentation/)
+- [Git Documentation](https://git-scm.com/doc)