doc: README: add note on installing gyp

Problem:
The instructions assume you have already installed gyp to
build/gyp.

If you run 'make' without doing so, it asks you to read the README,
which does not actually tell you about installing gyp.

Solution:
Add a one-liner `git clone` command to the setup instructions.

PR-URL: https://github.com/libuv/libuv/pull/1712
Reviewed-By: Saúl Ibarra Corretgé <saghul@gmail.com>
This commit is contained in:
Jamie Davis 2018-01-17 21:31:26 -05:00 committed by Santiago Gimeno
parent 875ce430a2
commit f60713f7cf
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@ -169,6 +169,12 @@ $ make check
$ make install
```
To build with GYP, first run:
```bash
$ git clone https://chromium.googlesource.com/external/gyp build/gyp
```
### Windows
Prerequisites: