Add .ccls to .gitignore

Change-Id: I054756a3d79971c7045e2f4a63c8cf4939613077
diff --git a/.gitignore b/.gitignore
index f24c442..d50bced 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,5 @@
 .android_config
+.ccls
 .ccls-cache
 .clangd
 .cproject