Update first-steps.md

Add termy tab for windows users to make it easier to run fastapi for the first time

docs/en/docs/tutorial/first-steps.md

@@ -8,6 +8,10 @@ Copy that to a file `main.py`.
 
 Run the live server:
 
+////
+
+//// tab | Linux, macOS
+
 <div class="termy">
 
 ```console
@@ -48,6 +52,50 @@ $ <font color="#4E9A06">fastapi</font> dev <u style="text-decoration-style:solid
 
 </div>
 
+////
+
+//// tab | Windows PowerShell
+
+<div class="termy">
+
+```console
+$ <font color="#4E9A06">py -m fastapi</font> dev <u style="text-decoration-style:solid">main.py</u>
+
+  <span style="background-color:#009485"><font color="#D3D7CF"> FastAPI </font></span>  Starting development server 🚀
+
+             Searching for package file structure from directories
+             with <font color="#3465A4">__init__.py</font> files
+             Importing from C:\Users\code\awesomeapp
+
+   <span style="background-color:#007166"><font color="#D3D7CF"> module </font></span>  🐍 main.py
+
+     <span style="background-color:#007166"><font color="#D3D7CF"> code </font></span>  Importing the FastAPI app object from the module with
+             the following code:
+
+             <u style="text-decoration-style:solid">from </u><u style="text-decoration-style:solid"><b>main</b></u><u style="text-decoration-style:solid"> import </u><u style="text-decoration-style:solid"><b>app</b></u>
+
+      <span style="background-color:#007166"><font color="#D3D7CF"> app </font></span>  Using import string: <font color="#3465A4">main:app</font>
+
+   <span style="background-color:#007166"><font color="#D3D7CF"> server </font></span>  Server started at <font color="#729FCF"><u style="text-decoration-style:solid">http://127.0.0.1:8000</u></font>
+   <span style="background-color:#007166"><font color="#D3D7CF"> server </font></span>  Documentation at <font color="#729FCF"><u style="text-decoration-style:solid">http://127.0.0.1:8000/docs</u></font>
+
+      <span style="background-color:#007166"><font color="#D3D7CF"> tip </font></span>  Running in development mode, for production use:
+             <b>fastapi run</b>
+
+             Logs:
+
+     <span style="background-color:#007166"><font color="#D3D7CF"> INFO </font></span>  Will watch for changes in these directories:
+             <b>[</b><font color="#4E9A06">&apos;C:\\Users\\code\\awesomeapp&apos;</font><b>]</b>
+     <span style="background-color:#007166"><font color="#D3D7CF"> INFO </font></span>  Uvicorn running on <font color="#729FCF"><u style="text-decoration-style:solid">http://127.0.0.1:8000</u></font> <b>(</b>Press CTRL+C
+             to quit<b>)</b>
+     <span style="background-color:#007166"><font color="#D3D7CF"> INFO </font></span>  Started reloader process <b>[</b><font color="#34E2E2"><b>383138</b></font><b>]</b> using WatchFiles
+     <span style="background-color:#007166"><font color="#D3D7CF"> INFO </font></span>  Started server process <b>[</b><font color="#34E2E2"><b>383153</b></font><b>]</b>
+     <span style="background-color:#007166"><font color="#D3D7CF"> INFO </font></span>  Waiting for application startup.
+     <span style="background-color:#007166"><font color="#D3D7CF"> INFO </font></span>  Application startup complete.
+```
+
+</div>
+
 In the output, there's a line with something like:
 
 ```hl_lines="4"