doc: add README for cmd

cmd/http-proxy/README.md

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+# http-proxy
+
+This is a sample implementation of HTTP(S) proxy.
+
+## Setup
+You need to generate a CA key and trust it.
+
+```sh
+openssl genrsa -out rootCAKey.pem 2048
+openssl req -x509 -sha256 -new -nodes -key rootCAKey.pem -days 3650 -out rootCACert.pem -subj "/CN=localhost"
+openssl x509 -outform der -in rootCACert.pem -out rootCA.crt
+```
+
+Install the certificate according to your environment.
+
+```sh
+trust anchor --store rootCA.crt
+```
+
+## Run
+```sh
+go run . -rootCACert rootCACert.pem -rootCAKey rootCAKey.pem
+```
+
+```sh
+curl -x http://localhost:8080 -v http://github.com/homuler/mitm-go
+curl -x http://localhost:8080 -v https://github.com/homuler/mitm-go
+curl -x https://localhost:8443 -v http://github.com/homuler/mitm-go
+curl -x https://localhost:8443 -v https://github.com/homuler/mitm-go
+curl --proxy-http2 https://localhost:8443 -v http://github.com/homuler/mitm-go
+curl --proxy-http2 https://localhost:8443 -v https://github.com/homuler/mitm-go
+```

cmd/http-tproxy/README.md

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+# http-tproxy
+
+This is a sample implementation of transparent HTTP(S) proxy.
+
+Note that this program assumes that the host machine is the default route of the client.
+If you are testing on a single machine, consider using `netns`.
+
+## Setup
+### Certificate
+You need to generate a CA key and trust it.
+
+```sh
+openssl genrsa -out rootCAKey.pem 2048
+openssl req -x509 -sha256 -new -nodes -key rootCAKey.pem -days 3650 -out rootCACert.pem -subj "/CN=mitm-go"
+openssl x509 -outform der -in rootCACert.pem -out rootCA.crt
+```
+
+Install the certificate according to your environment.
+
+```sh
+trust anchor --store rootCA.crt
+```
+
+### TPROXY
+You also need to configure TPROXY.
+
+```sh
+iptables -t mangle -N DIVERT
+iptables -t mangle -A DIVERT -j MARK --set-mark 1
+iptables -t mangle -A DIVERT -j ACCEPT
+iptables -t mangle -A PREROUTING -p tcp -m socket -j DIVERT
+iptables -t mangle -A PREROUTING -p udp -m socket -j DIVERT
+iptables -t mangle -A PREROUTING -p tcp --dport 80 -j TPROXY --tproxy-mark 0x1/0x1 --on-ip 127.0.0.1 --on-port 8080
+iptables -t mangle -A PREROUTING -p tcp --dport 443 -j TPROXY --tproxy-mark 0x1/0x1 --on-ip 127.0.0.1 --on-port 8443
+iptables -t mangle -A PREROUTING -p udp --dport 443 -j TPROXY --tproxy-mark 0x1/0x1 --on-ip 127.0.0.1 --on-port 443
+iptables -t mangle -A PREROUTING -p udp --dport 8443 -j TPROXY --tproxy-mark 0x1/0x1 --on-ip 127.0.0.1 --on-port 8443
+
+ip rule add fwmark 1 lookup 100
+ip route add local 0.0.0.0/0 dev lo table 100
+```
+
+## Run
+```sh
+go run . -rootCACert rootCACert.pem -rootCAKey rootCAKey.pem
+```
+
+```sh
+curl -v http://github.com/homuler/mitm-go
+curl -v https://github.com/homuler/mitm-go
+```