add cover for gitbook

ruanyf · Mar 29, 2018 · 0263136 · 0263136
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commit 0263136
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diff --git a/cover.jpg b/cover.jpg
@@ -0,0 +1 @@
+images/cover-3rd.jpg
diff --git a/cover_small.jpg b/cover_small.jpg
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+images/cover_thumbnail_3rd.jpg