update readme

README.md

@@ -2,7 +2,8 @@
 
 1. Download and install [Visual Studio Code](https://code.visualstudio.com/download) 
 2. Install [PlatformIO IDE extension](https://platformio.org/install/ide?install=vscode) for Visual Studio Code 
-3. Create [wifi_credentials.h](include/wifi_credentials.h) from [templ_wifi_credentials.h](include/templ_wifi_credentials.h) in include/
+3. Download sources from master branch, "zip" or "git clone"
+4. Create [wifi_credentials.h](include/wifi_credentials.h) from [templ_wifi_credentials.h](include/templ_wifi_credentials.h) in include/
 
 ```cpp
 #ifndef __WIFI_CREDENTIALS_H
@@ -16,14 +17,15 @@
 #endif // __WIFI_CREDENTIALS_H
 ```
 
-4. Create [platformio.ini](platformio.ini) from [templ_platformio_ini](templ_platformio_ini)
+5. Create [platformio.ini](platformio.ini) from [templ_platformio_ini](templ_platformio_ini)
 
-```bash
+```sh
 $ cp templ_platformio_ini platformio.ini
 ```
 
-5. __Uploading new firmware__
+6. __Uploading new firmware__
-```bash
+
+```sh
 # upload program via ota
 $ pio run -t upload
 # upload file system via ota