update installation methods

Author: njzjz

README.md

@@ -9,8 +9,11 @@
  	- [License and credits](#license-and-credits)
  	- [Deep Potential in a nutshell](#deep-potential-in-a-nutshell)
 - [Download and install](#download-and-install)
+    - [Easy installation methods](#easy-installation-methods)
+      - [With Docker](#with-docker)
+      - [With conda](#with-conda)
+      - [Offline packages](#offline-packages)
     - [Install the python interaction](#install-the-python-interface)
-      - [Easy installation methods](#easy-installation-methods)
       - [Install the Tensorflow's python interface](#install-the-tensorflows-python-interface)
       - [Install the DeePMD-kit's python interface](#install-the-deepmd-kits-python-interface)
     - [Install the C++ interface](#install-the-c-interface)
@@ -83,11 +86,29 @@ In addition to building up potential energy models, DeePMD-kit can also be used
 
 Please follow our [github](https://github.com/deepmodeling/deepmd-kit) webpage to see the latest released version and development version.
 
-## Install the python interface 
+## Easy installation methods
+There various easy methods to install DeePMD-kit. Choose one that you prefer. If you want to build by yourself, jump to the next two sections.
+
+### With Docker
+A docker for installing the DeePMD-kit on CentOS 7 is available [here](https://github.com/frankhan91/deepmd-kit_docker).
+
+### With conda
+DeePMD-kit is avaiable with [conda](https://github.com/conda/conda). Install [Anaconda](https://www.anaconda.com/distribution/#download-section) or [Miniconda](https://docs.conda.io/en/latest/miniconda.html) first.
+
+To install the CPU version:
+```bash
+conda install deepmd-kit=*=*cpu lammps-dp=*=*cpu -c deepmodeling
+```
 
-### Easy installation methods
-A docker for installing the DeePMD-kit on CentOS 7 is available [here](https://github.com/frankhan91/deepmd-kit_docker). We are currently working on installation methods using the `conda` package management system and `pip` tools. Hope these will come out soon.
+To install the GPU version containing [CUDA 10.0](https://docs.nvidia.com/deploy/cuda-compatibility/index.html#binary-compatibility__table-toolkit-driver):
+```bash
+conda install deepmd-kit=*=*gpu lammps-dp=*=*gpu -c deepmodeling
+```
 
+### Offline packages
+Both CPU and GPU version offline package are avaiable in [the Releases page](https://github.com/deepmodeling/deepmd-kit/releases).
+
+## Install the python interface 
 ### Install the Tensorflow's python interface
 First, check the python version and compiler version on your machine 
 ```bash