Add platform support to readme

README.md

@@ -36,6 +36,25 @@ Included in the official release but not yet implemented.
 * HTTP/2[^h2]
 * Bandwidth limit
 
+## Platform support
+The following conditions will be passed before release.
+
+* Build: CI build success
+* Run: Check binary runable
+* Test: Test on real environment
+
+|           Platform            | Build |  Run  | Test  |
+| ----------------------------- | :---: | :---: | :---: |
+| x86_64-unknown-linux-gnu      |  ✅   |  ✅  |  ✅   |
+| aarch64-unknown-linux-gnu     |  ✅   |  ❌  |  ❌   |
+| armv7-unknown-linux-gnueabihf |  ✅   |  ❌  |  ❌   |
+| x86_64-pc-windows-msvc        |  ✅   |  ✅  |  ❌   |
+| i686-pc-windows-msvc          |  ✅   |  ✅  |  ❌   |
+| x86_64-apple-darwin           |  ✅   |  ❌  |  ❌   |
+| aarch64-apple-darwin          |  ✅   |  ✅  |  ❌   |
+
+See https://doc.rust-lang.org/stable/rustc/platform-support.html
+
 
 [^disk]: Only checks the cache size and does not aware of downloads or other space usages.
 [^h2]: Multiplexing is useless for H@H, and a large number of connections will take up more system resources.