feat: add linux unixsocket readme

__linux/unixsocket/README.md

@@ -0,0 +1,23 @@
+
+Unix socket -> TCP
+```
+socat -d -d TCP-LISTEN:8080,fork,bind=127.0.0.1 UNIX:/var/run/docker.sock
+```
+
+cURL unix socket
+```
+curl --unix-socket /var/run/docker.sock http://localhost/images/json
+```
+
+unix socket -> TCP -> unix socket
+```
+sudo mv /var/run/docker.sock /var/run/docker.sock.original
+sudo socat TCP-LISTEN:8089,reuseaddr,fork UNIX-CONNECT:/var/run/docker.sock.original
+sudo socat UNIX-LISTEN:/var/run/docker.sock,fork TCP-CONNECT:127.0.0.1:8089
+```
+
+<br>
+
+https://plantegg.github.io/2019/04/04/就是要你懂抓包--Unix-Socket抓包/
+
+