chore: Update Go SDK getting started

docs/sdks/go.md

@@ -3,18 +3,85 @@ id: go_sdk
 title: GO SDK
 ---
 
+### 1. Install unleash-client-go
 
-```golang
+To install the latest version of the client use:
+
+```bash
+go get github.com/Unleash/unleash-client-go/v3
+```
+
+If you are still using Unleash Server v2.x.x, then you should use:
+
+```bash
+go get github.com/Unleash/unleash-client-go
+```
+
+### 2. Initialize unleash
+
+The easiest way to get started with Unleash is to initialize it early in your application code:
+
+```go
 import (
 	"github.com/Unleash/unleash-client-go/v3"
 )
 
 func init() {
 	unleash.Initialize(
-    unleash.WithAppName("my-node-app"),
+		unleash.WithListener(&unleash.DebugListener{}),
-    unleash.WithUrl("<API url>"),
+		unleash.WithAppName("my-application"),
+		unleash.WithUrl("http://unleash.herokuapp.com/api/"),
         unleash.WithCustomHeaders(http.Header{"Authorization": {"<Client secret>"}}),
 	)
 }
 ```
+
+### 3. Use unleash
+
+After you have initialized the unleash-client you can easily check if a feature
+toggle is enabled or not.
+
+```go
+unleash.IsEnabled("app.ToggleX")
+```
+
+### 4. Stop unleash
+
+To shut down the client (turn off the polling) you can simply call the
+destroy-method. This is typically not required.
+
+unleash.Close()
+
+### Built in activation strategies
+
+The Go client comes with implementations for the built-in activation strategies
+provided by unleash.
+
+- DefaultStrategy
+- UserIdStrategy
+- FlexibleRolloutStrategy
+- GradualRolloutUserIdStrategy
+- GradualRolloutSessionIdStrategy
+- GradualRolloutRandomStrategy
+- RemoteAddressStrategy
+- ApplicationHostnameStrategy
+
+Read more about the strategies in [activation-strategy.md]().
+
+### Unleash context
+
+In order to use some of the common activation strategies you must provide a
+[unleash-context](https://github.com/Unleash/unleash/blob/master/docs/unleash-context.md).
+This client SDK allows you to send in the unleash context as part of the `isEnabled` call:
+
+```go
+ctx := context.Context{
+    UserId: "123",
+    SessionId: "some-session-id",
+    RemoteAddress: "127.0.0.1",
+}
+
+unleash.IsEnabled("someToggle", unleash.WithContext(ctx))
+```
+
 Read more at [github.com/Unleash/unleash-client-go](https://github.com/Unleash/unleash-client-go)