[Installer] Add the installer v2 documents

Signed-off-by: hydai <[email protected]>

docs/contribute/installer_v2.md

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+---
+sidebar_position: 7
+---
+
+# Installer V2 Guide
+
+## Overview
+
+WasmEdge installer V2 is designed for installing the Core Tools (`wasmedge`, `wasmedge compile`), the Libraries (`libwasmedge`),  and the WASI-NN GGML/GGUF Plugin..
+
+## Dependencies
+
+This is a pure shell script implementation. The only dependecies are `curl` or `wget` for downloading the tarballs, and `tar` for extracting them.
+
+
+## Usage
+
+```bash
+curl -sSf https://raw.githubusercontent.com/WasmEdge/WasmEdge/master/utils/install_v2.sh | bash -s -- ${OPTIONS}
+```
+
+## Roles
+
+### `install_v2.sh`
+
+The installer entry point.
+
+## Options
+
+### Help Msg
+
+- Short Option: `-h`
+- Full Option: `--help`
+- Description: Show the help message and exit.
+
+### Verbose
+
+- Short Option: `-V`
+- Full Option: `--verbose`
+- Description: Enable verbosity debug
+
+### Specify the version of WasmEdge to install
+
+- Short Option: `-v VERSION`
+- Full Option: `--version=VERSION`
+- Description: Install the given VERSION of WasmEdge
+- Available Value: VERSION `{{ wasmedge_version }}` or other valid release versions.
+- Note - If supplied an invalid or nonexistent version, the installer exits with an error.
+
+### Installation path
+
+- Short Option: `-p PATH`
+- Full Option: `--path=PATH`
+- Description: Install WasmEdge into the given PATH. The default Path is `$HOME/.wasmedge`.
+- Note - Any paths other than the ones starting with `/usr` are treated as non-system paths in the internals of the installer. The consequences are different directory structures for both.
+
+### Temporary directory
+
+- Short Option: `-t PATH`
+- Full Option: `--tmpdir=PATH`
+- Description: Download the tarballs into the given PATH. The default Path is `/tmp`.
+- Note - If the `/tmp` directory is not writable, the installer exits with an error. Please use this option to change the temporary directory.
+
+### GGML/GGUF related options
+
+#### Install CUDA version of the GGUF plugin
+
+- Short Option: `-c cuda_version`
+- Full Option: `--ggmlcuda=cuda_version[11/12]`
+- Description: Install the specified CUDA version of the GGUF plugin. E.g. `11` for cuda-11, `12` for cuda-12.
+- Note - The installer will try to detect the CUDA version if not specified. However, if the detection failed, you can specify the version using this option.
+
+#### Specify the plugin version to install
+
+- Short Option: `-b ggmlversion`
+- Full Option: `--ggmlbn=ggmlversion`
+- Description: Install the specified GGUF plugin. E.g. `b2963`.
+- Note - Please use this option when you really know what you are doing.
+
+### Platform and OS
+
+- Short Option: `-o OS`
+- Full Option: `--os=OS`
+- Description: Install the given `OS` version of WasmEdge. This value should be case insensitive to make the maximum compatibility.
+- Available Value (case insensitive): "Linux", "Darwin".
+
+### Machine and Arch
+
+- Short Option: `-a ARCH`
+- Full Option: `--arch=ARCH`
+- Description: Install the `ARCH` version of WasmEdge.
+- Available Value: "x86\_64", "aarch64", "arm64".
+
+## Behavior
+
+- WasmEdge installation appends all the files it installs to a file which is located in the installer directory named `env` with its path as `$INSTALLATION_PATH/env`.
+
+### Shell and it's configuration
+
+- Source string in shell configuration is given as `. $INSTALLATION_PATH/env` so that it exports the necessary environment variables for WasmEdge.
+- Shell configuration file is appended with source string if it cannot find the source string in that file.
+- Currently, it detects only `Bash` and `zsh` shells.
+- If the above shells are found, then their respective configuration files `$HOME/.bashrc` and `$HOME/.zshrc` are updated along with `$HOME/.zprofile` and `$HOME/.bash_profile` in the case of Linux.
+- In the case of `Darwin`, only `$HOME/.zprofile` is updated with the source string.

docs/contribute/overview.md

@@ -15,6 +15,7 @@ To help new contributors understand WasmEdge development workflow, this guide wi
 - [WasmEdge Fuzzing](fuzzing.md)
 - [WasmEdge internal explanation](internal.md)
 - [WasmEdge installer system explanation](installer.md)
+- [WasmEdge installer v2 system explanation](installer_v2.md)
 - [contributing steps](contribute.md)
 - [WasmEdge release process](release.md)
 - [Join WasmEdge community](community.md)