pio-platform: add page (tldr-pages#5727)

pages/common/pio-platform.md

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+# 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`