pio-platform: add page (#5727)

pages/common/pio-platform.md

@@ -0,0 +1,32 @@
+# pio platform
+
+> Manage PlatformIO development platforms.
+> More information: <https://docs.platformio.org/en/latest/core/userguide/platforms/>.
+
+- List all installed development platforms:
+
+`pio platform list`
+
+- Search for existing development platforms:
+
+`pio platform search {{platform}}`
+
+- Show details about a development platform:
+
+`pio platform show {{platform}}`
+
+- Install a development platform:
+
+`pio platform install {{platform}}`
+
+- Update installed development platforms:
+
+`pio platfom update`
+
+- Uninstall a development platform:
+
+`pio platform uninstall {{platform}}`
+
+- List all supported frameworks:
+
+`pio platform frameworks`