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Update Readme for install etcd client v3 more visibility #13108

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There are many developers on the web, confused by how to install etcd v3 for the development of go project.

A number of similar errors were encountered, as follows:
https://github.com/etcd-io/etcd/issues/13108

```
➜  ~ go version
go version go1.16.5 darwin/amd64

➜  ~  go get go.etcd.io/etcd/clientv3

go: downloading golang.org/x/net v0.0.0-20201021035429-f5854403a974
# github.com/coreos/etcd/clientv3/balancer/picker
go/pkg/mod/github.com/coreos/etcd@v3.3.25+incompatible/clientv3/balancer/picker/err.go:37:44: undefined: balancer.PickOptions
go/pkg/mod/github.com/coreos/etcd@v3.3.25+incompatible/clientv3/balancer/picker/roundrobin_balanced.go:55:54: undefined: balancer.PickOptions
# github.com/coreos/etcd/clientv3/balancer/resolver/endpoint
go/pkg/mod/github.com/coreos/etcd@v3.3.25+incompatible/clientv3/balancer/resolver/endpoint/endpoint.go:114:78: undefined: resolver.BuildOption
go/pkg/mod/github.com/coreos/etcd@v3.3.25+incompatible/clientv3/balancer/resolver/endpoint/endpoint.go:182:31: undefined: resolver.ResolveNowOption
```

There are many examples of confusion here:

- https://github.com/etcd-io/etcd/issues/12577
- https://github.com/etcd-io/etcd/issues/12181
- https://github.com/etcd-io/etcd/issues/12068
- https://github.com/etcd-io/etcd/issues/11931
......

So, As suggested by  @lilic , I submitted Readme update.
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@ -153,6 +153,15 @@ Follow the steps in [Procfile.learner](./Procfile.learner) to add a learner node
goreman -f ./Procfile.learner start
```
### Install etcd client v3
```bash
go get go.etcd.io/etcd/client/v3
```
`etcd/clientv3` is the official Go etcd client for v3. Read more:[etcd client v3 install](https://github.com/etcd-io/etcd/tree/main/client/v3#install)
Notes to resolve dependency and compatibility issues for go modules: [#13108](https://github.com/etcd-io/etcd/issues/13108)
### Next steps
Now it's time to dig into the full etcd API and other guides.