Enhance README.md

README.md

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 # UniVRM
 
-UniVRM is `unity package` for Import and Export [VRM Format](https://vrm.dev/vrm_about/) 
+![GitHub latest release](https://img.shields.io/github/v/release/vrm-c/UniVRM?color=green)
+![GitHub license](https://img.shields.io/github/license/vrm-c/UniVRM)
 
-## Download
+The standard implementation of 3D Avatar file format [VRM](https://vrm-consortium.org/en/) for [Unity](https://unity.com/).
 
-* https://github.com/vrm-c/UniVRM/releases
+UniVRM supports import and export the VRM file at both runtime and editor.
+VRM is an extension of [glTF 2.0](https://www.khronos.org/gltf/), so this library also support the glTF file.
 
-## Manual
+## Features
 
-* https://vrm.dev/docs/univrm/
+UniVRM supports the [VRM 1.0 specification](https://github.com/vrm-c/vrm-specification) and the [glTF 2.0 specification](https://registry.khronos.org/glTF/).
 
-## API Document
+UniVRM can import/export following supported file types at both runtime and editor.
 
-* https://vrm-c.github.io/UniVRM/
+### Supported file types
+- VRM 1.0 (.vrm)
+- VRM 0.x (.vrm)
+- glTF 2.0 (.glb | .gltf | .zip)
+
+### Import features
+- You can import supported file types at both runtime and editor.
+- Support for async/await importing at runtime.
+- Support for Migration VRM 0.x files into VRM 1.0 files.
+- Support for ScriptedImporter for VRM 1.0 and glTF 2.0.
+- You can import glTF's PBR materials into Unity Built-in RP's Standard materials.
+
+### Export features
+- You can export supported file types at both runtime and editor.
+- You can export Unity Built-in RP's Standard materials into glTF's PBR materials.
+
+## Requirements
+
+The latest UniVRM supports Unity 2020.3 LTS or later.
+
+## Installation
+
+![GitHub latest release](https://img.shields.io/github/v/release/vrm-c/UniVRM?color=green)
+
+You can install UniVRM using the UnityPackager or UPM Package.
+
+### UnityPackage
+
+From the [latest release](https://github.com/vrm-c/UniVRM/releases/latest), you can download the `.unitypackage` files.
+
+- For handling VRM 1.0
+    - You can download **VRM-0.XXX.X-YYYY.unitypackage**.
+    - You can also download sample projects as **VRM_Samples-0.XXX.X-YYYY.unitypackage**.
+- For handling VRM 0.x
+    - You can download **UniVRM-0.XXX.X-YYYY.unitypackage**.
+    - You can also download sample projects as **UniVRM_Samples-0.XXX.X-YYYY.unitypackage**.
+- For handling glTF 2.0
+    - You can download **VRM-0.XXX.X-YYYY.unitypackage**.
+
+### UPM Package
+
+From the [latest release](https://github.com/vrm-c/UniVRM/releases/latest), you can find UPM package urls.
+
+- For import/export VRM 1.0
+    - You have to install all of the following UPM packages.
+        - `com.vrmc.vrmshaders`
+        - `com.vrmc.gltf`
+        - `com.vrmc.vrm`
+- For import/export VRM 0.x
+    - You have to install all of the following UPM packages.
+        - `com.vrmc.vrmshaders`
+        - `com.vrmc.gltf`
+        - `com.vrmc.univrm`
+- For import/export glTF 2.0
+    - You have to install all of the following UPM packages.
+        - `com.vrmc.vrmshaders`
+        - `com.vrmc.gltf`
+
+You can install these UPM packages via `Package Manager` -> `+` -> `Add package from git URL...` in UnityEditor.
+
+## Documentation
+
+- https://vrm.dev/en/vrm/index.html
+
+### For developers
+
+- https://vrm-c.github.io/UniVRM/en/
 
 ## License