improve readme.md

[dongzhuoer]

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.

[jbeder]

How about just inserting a new step of

"Clone the repository and navigate into the source directory"?

Also, what if someone just wants to download the tarball?

[dongzhuoer]

The key point is to make it clear that the user should be at the repository directory, rather than the src directory. Maybe show the output of ls is a better solution.

[jbeder]

I don't know; is the original really unclear?

[dongzhuoer]

Based on the fact that GitHub is a place to storage source code, you can say that the whole repository directory is the source directory. But inside it, we can also say that test is the testing directory, util is the utility directory, src is the source directory. That's why I cd into src.
Maybe you can use repository directory instead. But I think the following way will make it crystal clear. User don't have to struggle to guess the meaning of every word exactly the same as how you understand it.

mkdir build
cd build
ls

build            LICENSE    yaml-cpp-config.cmake.in
CMakeLists.txt   README.md  yaml-cpp-config-version.cmake.in
CONTRIBUTING.md  src        yaml-cpp.pc.cmake
include          test
install.txt      util

[SimplyKnownAsG]

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