feat: readme

README.md

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+# Proxy Pool Tools
+
+Use local ipv4/ipv6 proxy pool to crawl web pages.
+
+Inspired by [http-proxy-ipv6-pool](https://zu1k.com/posts/tutorials/http-proxy-ipv6-pool/)
+
+## Get Started
+
+### Install
+
+TODO
+
+### Prepare
+
+Get IPv6 subnet from your VPS provider, and add it to your server.
+
+```bash
+$ ip a
+2: ens4: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1460 qdisc mq state UP group default qlen 1000
+    link/ether 42:01:0a:02:00:02 brd ff:ff:ff:ff:ff:ff
+    altname enp0s4
+    inet 10.2.0.2/32 metric 100 scope global dynamic ens4
+       valid_lft 2455sec preferred_lft 2455sec
+    inet6 2600:1900:4000:39cb::/128 scope global dynamic
+       valid_lft 3214sec preferred_lft 3214sec
+    inet6 fe80::4001:aff:fe02:2/64 scope link
+       valid_lft forever preferred_lft forever
+```
+
+Add route via interface `ens4`:
+
+```bash
+sudo ip route add local 2600:1900:4000:39cb::/64 dev ens4
+```
+
+Set ip nonlocal bind:
+
+```bash
+sudo sysctl -w net.ipv6.ip_nonlocal_bind=1
+```
+
+For IPv6 NDP, install and start `ndppd`:
+
+```bash
+sudo apt update && sudo apt install -y ndppd
+```
+
+then edit `/etc/ndppd.conf`:
+
+```bash
+route-ttl 30000
+
+proxy <INTERFACE-NAME> {
+    router no
+    timeout 500
+    ttl 30000
+
+    rule <IP6_SUBNET> {
+        static
+    }
+}
+```
+
+and start `ndppd`:
+
+```bash
+sudo systemctl start ndppd
+```
+
+Now you can use the IPv6 subnet to create proxy pool.
+
+```bash
+$ curl --interface 2600:1900:4000:39cb::1 ifv6.ip.sb
+2600:1900:4000:39cb::1
+$ curl --interface 2600:1900:4000:39cb::2 ifv6.ip.sb
+2600:1900:4000:39cb::2
+```