Update building process with the latest process

doc/Building.md

@@ -1,19 +1,26 @@
-# Building 
+# Building CloudTik
 
 ## Building for Linux
 
-Before you start to build wheels for CloudTik, we recommend you create a python environment (>= Python 3.7)
+Before you start to build wheels for CloudTik, we recommend you create a python environment (>= Python 3.7).
 
-If with conda, run
+### 1. Install prerequisit package for building enviroment
+We provide ```./dev/install-dev.sh``` to for installing build dependencies on Ubtuntu systems.
 ```
-conda create -n cloudtik-py37 -y python=3.7
-conda activate cloudtik-py37
+bash ./dev/install-dev.sh
 ```
 
-Then build CloudTik wheels with our provided script.
+### 2. Create a Python environment (>= Python 3.7)
+We suggest you use Conda to manage Python environment. You can refer ```./dev/install-conda.sh``` if Conda installation is needed. Execute the following command to create a Python environment for building, replacing the environment name if you want.
+
+```
+conda create -n cloudtik -y python=3.7
+conda activate cloudtik
+```
+
+### 3. Build CloudTik wheels with our provided script
+Execute below command to start the build.
 ```
-git clone https://github.com/Intel-bigdata/cloudtik.git
-cd cloudtik/python
-bash build-wheel-manylinux2014.sh
+bash build.sh
 ```
 Then under `cloudtik/python/dist` directory, you will find the `*.whl` which is your current specific python version's CloudTik wheel for Linux.