Docs: Add install instructions for spaced (Realme 8i / Narzo 50)

12/spaced.md

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+### Pre-installation
+Before you begin, ensure you have downloaded all the necessary files to your PC:
+* **ROM Zip:** The main custom ROM installation file.
+* **Firmware & Recovery:** The latest RealmeUI firmware, `boot.img`, and `vendor_boot.img`.
+* **GApps Package (Optional):** Available via the "GApps" button on the download page.
+* **Copy-Partitions:** `copy-partitions-signed.zip` *(Required only if you are on firmware `RMX3151export_13.f18` or newer)*.
+
+---
+
+### First-Time Installation (Clean Flash)
+
+1. **Boot to Recovery**
+   * Connect your phone to your PC and reboot to the bootloader:
+     ```bash
+     adb reboot bootloader
+     ```
+   * Flash the required partition images:
+     ```bash
+     fastboot flash boot boot.img
+     fastboot flash vendor_boot vendor_boot.img
+     ```
+   * Reboot into the newly flashed recovery:
+     ```bash
+     fastboot reboot recovery
+     ```
+
+2. **Format Data**
+   * In recovery, select **Format Data** and confirm.
+
+3. **Flash Copy-Partitions *(Conditional)***
+   * *Skip this step if you are on older firmware.*
+   * Navigate to **Apply Update** -> **Apply from ADB**.
+   * Sideload the partitions script:
+     ```bash
+     adb sideload copy-partitions-signed.zip
+     ```
+   * Once completed, **reboot back to recovery** before proceeding.
+
+4. **Flash the ROM**
+   * Navigate to **Apply Update** -> **Apply from ADB**.
+   * Sideload the ROM zip (this may take a few minutes):
+     ```bash
+     adb sideload rom.zip
+     ```
+
+5. **Flash GApps *(Optional)***
+   * If you want Google Apps, **reboot to recovery** once more.
+   * Navigate to **Apply Update** -> **Apply from ADB** and sideload GApps:
+     ```bash
+     adb sideload gapps.zip
+     ```
+
+6. **Reboot**
+   * Select **Reboot System** and enjoy!
+
+---
+
+### Update Installation (Dirty Flash)
+
+#### Method 1: Via Recovery (Recommended)
+1. Reboot your device into recovery mode.
+2. Navigate to **Apply Update** -> **Apply from ADB** and sideload the updated ROM:
+   ```bash
+   adb sideload rom.zip