improve readme.md

In the second step, I treat `source directory` as the `src` directory. 

Though my version seems a little verbose, it's at least unambiguous. I think it's important to make it clear whether the user should be.

Feel free to make modifications.
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Zhuoer Dong 2018-01-15 09:40:47 +08:00 committed by GitHub
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@ -16,9 +16,11 @@ yaml-cpp uses [CMake](http://www.cmake.org) to support cross-platform building.
**Note:** If you don't use the provided installer for your platform, make sure that you add CMake's bin folder to your path.
2. Navigate into the source directory, and type:
2. clone this repository, navigate into the source directory, and make a `build` directory and navigate into it:
```
git clone git@github.com:jbeder/yaml-cpp.git
cd yaml-cpp
mkdir build
cd build
```