add how to install `pip`

Project: http://git-wip-us.apache.org/repos/asf/incubator-s2graph/repo
Commit: http://git-wip-us.apache.org/repos/asf/incubator-s2graph/commit/aad8b72b
Tree: http://git-wip-us.apache.org/repos/asf/incubator-s2graph/tree/aad8b72b
Diff: http://git-wip-us.apache.org/repos/asf/incubator-s2graph/diff/aad8b72b

Branch: refs/heads/master
Commit: aad8b72bb8dc2e9ae4dd2dad02282b235a82f585
Parents: 625341d
Author: daewon <[email protected]>
Authored: Tue Nov 13 17:22:58 2018 +0900
Committer: daewon <[email protected]>
Committed: Tue Nov 13 17:22:58 2018 +0900

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 doc/readme.md | 3 +++
 1 file changed, 3 insertions(+)
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http://git-wip-us.apache.org/repos/asf/incubator-s2graph/blob/aad8b72b/doc/readme.md
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diff --git a/doc/readme.md b/doc/readme.md
index 63a2c80..9b1349d 100644
--- a/doc/readme.md
+++ b/doc/readme.md
@@ -21,6 +21,9 @@ cd doc
 ```
 
 ### Creating a virtualenv environment for documnet build
+
+If `pip` is not installed, you need to install it first by referring to the 
link: https://pip.pypa.io/en/stable/installing/
+
 ```
 pip install virtualenv
 

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