docs: add denode manager desktop guide

Author: polikasov

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+# DeNode Manager Desktop Installation and Launch Guide
+
+## Step 1. Download DeNode Manager Desktop
+
+1. Visit:  
+   [https://github.com/DeNetPRO/Node/releases](https://github.com/DeNetPRO/Node/releases)
+2. Download the latest application executable for your OS (Linux or Windows).
+
+![Assets](/assets/asset_list_1.png)
+
+---
+
+## Step 2. Install and start the app
+
+### Windows
+
+#### 1. Open the downloaded **.exe** file.
+#### 2. Follow the installer instructions:  
+   **Next → Install → Finish**
+
+![Screen](/assets/windows_screen_1.png)
+
+#### 3. Launch the **DeNode Manager** application.
+
+![Screen](/assets/windows_screen_2.png)
+
+---
+
+### Linux
+
+#### 1. Download the latest version of DeNode Manager Desktop
+
+**Option 1 — via GitHub (see Step 1).**
+
+**Option 2 — via Terminal:**
+Open Terminal: Use Ctrl + Alt + T or your terminal shortcut. Or SSH to your remote host.
+
+Then run the command:
+
+```bash
+curl -LO https://github.com/DeNetPRO/Node/releases/download/dm-desktop-v1.0.0/DeNode_Manager_1.0.0_amd64.deb
+```
+
+---
+
+#### 2. Install the application
+
+Install the downloaded `.deb` package:
+
+```bash
+sudo dpkg -i DeNode_Manager_1.0.0_amd64.deb
+```
+
+If dependency errors occur, run:
+
+```bash
+sudo apt-get install -f -y
+```
+
+This command will automatically fix missing dependencies and complete the installation.
+
+---
+
+#### 3. Allow **denode** executable
+
+```bash
+chmod +x /usr/lib/DeNode\ Manager/bin/denode
+```
+
+> ⚠ The path may vary depending on your system.
+
+---
+
+![Screen](/assets/linux_screen_1.jpg)
+
+#### 4. Start the app
+
+Launch the application — open your applications menu and find DeNode Manager.
+
+If your system provides a launcher shortcut, you can use it as well.
+
+![Screen](/assets/linux_screen_2.jpg)