add ipam help content

Signed-off-by: bingshen.wbs <[email protected]>

README.md

@@ -7,5 +7,6 @@ A collection of helper packages to extend Docker Engine in Go
  Authorization | [Link](https://docs.docker.com/engine/extend/authorization/)   | Extend API authorization mechanism
  Network       | [Link](https://docs.docker.com/engine/extend/plugins_network/) | Extend network management
  Volume        | [Link](https://docs.docker.com/engine/extend/plugins_volume/)  | Extend persistent storage
+ IPAM          | [Link](https://github.com/docker/libnetwork/blob/master/docs/ipam.md) | Extend IP address management
 
 See the [understand Docker plugins documentation section](https://docs.docker.com/engine/extend/plugins/).

ipam/README.md

@@ -0,0 +1,31 @@
+# Docker IPAM extension API
+
+Go handler to create external IPAM extensions for Docker.
+
+## Usage
+
+This library is designed to be integrated in your program.
+
+1. Implement the `ipam.Driver` interface.
+2. Initialize a `ipam.Handler` with your implementation.
+3. Call either `ServeTCP` or `ServeUnix` from the `ipam.Handler`.
+
+### Example using TCP sockets:
+
+```go
+  import "github.com/docker/go-plugins-helpers/ipam"
+
+  d := MyIPAMDriver{}
+  h := ipam.NewHandler(d)
+  h.ServeTCP("test_ipam", ":8080")
+```
+
+### Example using Unix sockets:
+
+```go
+  import "github.com/docker/go-plugins-helpers/ipam"
+
+  d := MyIPAMDriver{}
+  h := ipam.NewHandler(d)
+  h.ServeUnix("root", "test_ipam")
+```