update doc: added vim

Linux/LPIC1/09-vim.md

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+# Getting Started with Vim 📝
+
+## 1. Installing Vim
+
+To install Vim on a Debian‑based system (like Ubuntu), run:
+
+```bash
+sudo apt update
+sudo apt install vim
+```
+
+---
+
+## 2. Opening Files or Directories
+
+* **Open a file**
+
+  ```bash
+  vim <filename>
+  ```
+
+* **Open a directory**
+
+  ```bash
+  vim <directory_name>
+  ```
+
+  (This opens Vim’s file browser—helpful for navigating and editing multiple files.)
+
+---
+
+## 3. Vim Modes
+
+Vim works in multiple modes—here are the core ones:
+
+1. **Normal mode** – The default mode; used for navigation and commands.
+2. **Insert mode** – For editing text; enter it by pressing `i`, `a`, or `o`.
+3. **Visual mode** – For selecting text; enter it with `v`, `V`, or `Ctrl+v`.
+
+---
+
+## 4. Essential Commands
+
+(Type these in **Normal mode** and then press Enter when needed)
+
+| Command     | Description                               |
+| ----------- | ----------------------------------------- |
+| `:w`        | Save (write changes to the current file)  |
+| `:w <name>` | Save changes to a specified file `<name>` |
+| `:wq`       | Save and quit Vim                         |
+| `:q`        | Quit (only if no unsaved changes exist)   |
+| `:q!`       | Quit without saving (discard all changes) |
+
+---
+
+## 5. Handy Shortcuts
+
+These are core shortcuts used in **Normal mode**:
+
+| Shortcut | Action                           |
+| -------- | -------------------------------- |
+| `dd`     | Delete (cut) the current line    |
+| `yy`     | Yank (copy) the current line     |
+| `p`      | Paste after the cursor           |
+| `u`      | Undo the last change             |
+| `gg`     | Go to the first line of the file |
+
+---
+
+## 6. Quick Usage Flow
+
+1. **Start Vim**:
+
+   ```bash
+   vim example.txt
+   ```
+
+2. **Insert text**:
+   Press `i` → type your content → press `Esc` to return to **Normal mode**.
+
+3. **Save your work**:
+   Type `:w` in Normal mode and press Enter.
+
+4. **Make edits**:
+
+   * Use `dd` to delete a line
+   * Use `yy` to copy (yank) a line
+   * Move the cursor to a new location, then hit `p` to paste
+   * Press `u` to undo any mistake
+
+5. **Navigate quickly**:
+
+   * `gg` to jump to the beginning
+   * Use arrow keys or `h`, `j`, `k`, `l` for navigation
+
+6. **Finish editing**:
+
+   * `:wq` to save and exit
+   * `:q!` to exit without saving
+
+---
+
+## 7. Tips & Tricks
+
+* **Visual mode**:
+  Press `v` to start selecting character by character, `V` for line selection, or `Ctrl+v` for block-wise selection.
+
+* **Other navigation**:
+
+  * Use `G` to go to the end of the file
+  * Use a number before a command, e.g., `5dd` deletes 5 lines
+
+---
+
+### Summary
+
+Vim may feel different at first, but once you get comfortable switching between **Insert**, **Normal**, and **Visual** modes, you'll find it’s a powerful and efficient editor.
+Happy Vimming! 😊
+