feat(v2.3.x): support v2.3.x (#13)

* feat(v2.3.x): support v2.3.x

support v2.3.x

* feat(session): add SessionReleaseIfPresent detail

add SessionReleaseIfPresent detail

docs/en-US/v2.3.x/README.md

@@ -0,0 +1,129 @@
+---
+title: Quickly Start
+lang: en-US
+---
+
+# Quickly Start
+
+First make sure you have GO installed, version 1.16 or higher, and that you have set the GOPATH environment variable and added GOPATH/bin to the environment variable.
+
+> We recommend that you simply use the latest stable version, as we try to stay on top of the latest version of Go.
+
+Or you can refer:
+
+[Windows installation](environment/install_go_windows.md)
+
+[Linux installation](environment/install_go_linux.md)
+
+[Mac installation](environment/install_go_mac.md)
+
+**Please note that after `Beego` V2 we require the `go mod` feature, make sure that the `go mod` feature is turned on, i.e. `GO111MODULE=on`**. More details refer to [Go module](environment/go_mod.md)
+
+Or you can specify the GOPROXY:
+
+```shell
+GOPROXY=https://goproxy.cn
+```
+
+Next, let's try to start a `hello world` example. In this example, we will use the `Bee` tool to create the `hello world` project.
+
+More details refer to [Bee](./bee/README.md)
+
+## Steps
+
+If you already have a development environment installed, then you may consider using our quick install script.
+
+### Mac or Linux
+
+Run:
+
+```shell
+bash <(curl -s https://raw.githubusercontent.com/beego/beego-doc/main/scripts/quickstart.sh)
+```
+
+Or using wget:
+
+```shell
+bash <(wget -qO- https://raw.githubusercontent.com/beego/beego-doc/main/scripts/quickstart.sh)
+```
+
+### Windows
+
+Using `curl`：
+
+```shell
+bash <(curl -s https://raw.githubusercontent.com/beego/beego-doc/main/scripts/quickstart.bat)
+```
+
+Or `wget`
+
+```shell
+bash <(wget -qO- https://raw.githubusercontent.com/beego/beego-doc/main/scripts/quickstart.bat)
+```
+
+## Manual Installation
+
+In this section, we will use the `go get` command, so if you are not familiar with it, we suggest that you read [Go get](environment/go_get_command.md)
+
+Always remember, if you experience network problems, or timeout issues, make sure you set up the `GOPROXY` proxy.
+
+### Install Bee
+
+Run:
+
+```shell
+go get -u github.com/beego/bee/v2@latest
+```
+
+And then
+
+```shell
+bee version
+```
+
+you can see:
+
+```shell
+| ___ \
+| |_/ /  ___   ___
+| ___ \ / _ \ / _ \
+| |_/ /|  __/|  __/
+\____/  \___| \___| v2.0.x
+
+├── Beego     : Beego is not installed. Please do consider installing it first: https://github.com/beego/beego/v2. If you are using go mod, and you don't install the beego under $GOPATH/src/github.com/beego, just ignore this.
+├── GoVersion : go1.16
+├── GOOS      : linux
+├── GOARCH    : amd64
+├── NumCPU    : 12
+├── GOPATH    : /home/xxx/go
+├── GOROOT    : /home/aaa/bbb/go
+├── Compiler  : gc
+└── Published : 2020-12-16
+
+```
+
+### Create Project
+
+Run:
+
+```shell
+bee new hello
+cd hello
+go mod tidy
+```
+
+And then:
+
+```shell
+bee run
+```
+you can see:
+
+```shell
+2021/03/31 23:29:19 SUCCESS  ▶ 0004 Built Successfully!
+2021/03/31 23:29:19 INFO     ▶ 0005 Restarting 'hello'...
+2021/03/31 23:29:19 SUCCESS  ▶ 0006 './hello' is running...
+2021/03/31 23:29:22.016 [I] [parser.go:413]  generate router from comments
+
+2021/03/31 23:29:22.016 [I] [server.go:241]  http server Running on http://:8080
+```