add english version for language section (3.0) (apache#994)

Co-authored-by: Yunkun Huang <[email protected]>

.gitignore

@@ -7,3 +7,4 @@ package-lock.json
 .idea/
 
 .DS_Store
+/.hugo_build.lock

content/en/docs/v3.0/languages/_index.md

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+
+---
+type: docs
+title: "Multi-language implementation"
+linkTitle: "multi-language"
+weight: 60
+description: "Dubbo support multi-language implementation, please learn about the special usage of each language"
+---

content/en/docs/v3.0/languages/erlang/_index.md

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+
+---
+type: docs
+title: "Erlang"
+linkTitle: "Erlang"
+weight: 200
+description: "Erlang support"
+---
+

content/en/docs/v3.0/languages/erlang/quick-start.md

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+---
+type: docs
+title: "Quick start "
+linkTitle: "Quick start"
+weight: 1
+description: "Erlang Quick start"
+---
+
+It is recommended to use java to define the interface jar first, and use the [erlanalysis](https://github.com/apache/dubbo-erlang/tree/master/tools/erlanalysis) tool to parse the java interface to Erlang lib
+
+
+## Import dependent libraries
+
+### Use the Rebar compilation tool.
+
+Add dubblerl to rebar.config to your project
+
+```erlang
+{deps, [
+    {dubboerl, {git, "https://github.com/apache/dubbo-erlang.git", {branch, "master"}}}
+]}.
+```
+
+### Use erlang.mk compilation tool
+
+`in progress...`
+
+## Import interface library
+Suppose the interface lib you exported is called dubbo_service.   
+* If you didn't upload your lib to your git repository, It is recommended that you copy the `dubbo_service` lib 
+into the project's `apps` directory.  
+* If it is uploaded to your git repository, you can import like this:
+```erlang
+{deps, [
+    {dubboerl, {git, "https://github.com/apache/dubbo-erlang.git", {branch, "master"}}},
+    {dubbo_service,{git,"${INTERFACE_LIB_URL}",{branch,"master"}}} %% replace ${INTERFACE_LIB_URL} with your lib git repos url
+]}.
+```
+
+## Consumer configuration
+Please reference [Reference Config](./reference.md)
+
+## Init dubbolib in your project
+It is need you 
+```erlang
+dubboerl:init().
+```
+
+## How to call？
+
+### Synchronous call
+
+```erlang
+Request = #userInfoRequest{requestId = 123, username = "testname"},
+{ok,RequestRef,Response,RpcContent}  = userOperator:queryUserInfo(Request,#{sync=> true}).
+```
+If it occur error, is reponse `{error,Reason}`. 
+
+### Asynchronous call
+
+Default is Async call.
+```erlang
+Request = #userInfoRequest{requestId = 123, username = "testname"},
+{ok,RequestRef} = userOperator:queryUserInfo(Request).
+
+%% you can receive the message after.
+handle_cast({msg_back,RequestRef,Response,RpcContent},State).
+```
+
+## Example
+Refer to [dubboerl_demo](https://github.com/apache/dubbo-erlang/tree/master/samples)

content/en/docs/v3.0/languages/erlang/reference.md

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+---
+type: docs
+title: "Consumer configuration"
+linkTitle: "Consumer configuration"
+weight: 2
+description: "Configure consumers in erlang"
+---
+
+## Basic configuration
+
+Consumers need to add configuration items to `sys.config` file `dubboerl` filed.
+
+```erlang
+{dubboerl,[
+	%% other config ...
+	{consumer,[
+		{<<"interface fullname">>,[Option]},
+		%% eg:
+		{<<"org.apache.dubbo.erlang.sample.service.facade.UserOperator">>,[]},
+	]}
+]}
+```
+
+Option is to be added.

content/en/docs/v3.0/languages/erlang/serialization.md

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+---
+type: docs
+title: "Serialized configuration items"
+linkTitle: "Serialized configuration items"
+weight: 4
+description: "Configure the serialization method in erlang"
+---
+
+The library currently only implements the `dubbo://` communication protocol.
+
+It supports `hessian` and `json` as serialization method.
+
+## Configuration example
+
+Provider configuration items to add to the `sys.config` file `dubboerl` field.
+
+```erlang
+{dubboerl,[
+	%% other config ...
+	{protocol,hessian}
+]}
+```
+
+| ConfigName | Type | DefaultValue | Remarks |
+| --- | --- | --- | --- |
+| protocol | atom() | hessian | hessian,json |

content/en/docs/v3.0/languages/erlang/service.md

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+---
+type: docs
+title: "Provider configuration"
+linkTitle: "Provider configuration"
+weight: 3
+description: "Configure service provider in erlang"
+---
+
+## basic configuration
+
+Provider configuration items to add to the `sys.config` file `dubboerl` field
+
+```erlang
+{dubboerl,[
+	%% other config ...
+	{provider,[
+		{module_implements,interface_module,interface_fullname,[Options]},
+		%% eg:
+		{userOperator_impl,userOperator,<<"org.apache.dubbo.erlang.sample.service.facade.UserOperator">>,[Option]}
+	]}
+]}
+```
+
+| ConfigName | Type | DefaultValue | Remarks |
+| --- | --- | --- | --- |
+| module_implements | atom() | - | The service implements module name|
+| interface_module | atom() | - | Interface module name is transfer form java jar |
+| interface_fullname | binary() | - | Interface full name is the java class name |
+
+Option is to be added.

content/en/docs/v3.0/languages/golang/_index.md

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+
+---
+type: docs
+title: "golang"
+linkTitle: "golang"
+weight: 200
+description: "golang support"
+---
+

content/en/docs/v3.0/languages/golang/go-specific.md

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+---
+type: docs
+title: "Go language definition service"
+linkTitle: "Go language definition service"
+weight: 10
+description: ""
+---