Добавил инструкцию по прошивке в Windows ru/eng (flipperdevices#3)

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* Добавил инструкцию по прошивке в Windows

* Add images to eng section of Firm Flash

* Update flashing-firmware.md

Author: Karator

en/content/assets/1-win-en.png

@@ -6,7 +6,41 @@ You can skip this part if you have `dfu-util` installed.
 
 ### Windows
 
-_TODO_
+#### Preperation
+
+To flash Flipper in Windows we need `DfuSeDemo` software and firmware in `*.dfu` format. 
+
+Download actual firmware [here](https://update.flipperzero.one/master/firmware/firmware.dfu).
+You can get DfuSeDemo from official [site](https://www.st.com/en/development-tools/stsw-stm32080.html).
+It’s completely free, you just need to register during downloading process.
+
+#### Flashing
+
+On Flipper enter in DFU mode and connect to PC.
+As you can see our Flipper One named as `DFU in FS Mode` and wee need to install compatible driver.
+![](assets/1-win-en.png)
+
+Go to Windows Update Centre -> View optional updates.
+![](assets/2-win-en.png)
+
+Find `STMicroelectronics` in driver updates, mark it and press “Download and install”.
+![](assets/3-win-en.png)
+
+Check in Device Manager that name of the device has already changed to «STM Device in DFU Mode».
+In some cases, reboot is required.
+![](assets/4-win-en.png)
+
+Now it’s time to install and run DfuSeDemo.
+You can select our device `STM Device in DFU Mode` in top section of the app. 
+After that choose `00  Internal Flash  256 sectors…` section in targets table.
+Next click `Choose` in the bottom of the window and find firmware file.
+![](assets/5-win-en.png)
+
+After all preperations press Upgrade and click “Yes” in pop-up window.
+![](assets/6-win-en.png)
+
+Reboot Flipper after successful upgrade. Done!
+![](assets/6-win-en.png)
 
 ### macOS
 
@@ -76,4 +110,4 @@ dfu-util -a 0 -s 0x08000000 -D full_firmware_latest.bin
 
 After flashing the firmware, [reboot](rebooting.md) to exit DFU mode.
 
-The USB cable can be unplugged before or after rebooting.
+The USB cable can be unplugged before or after rebooting.