Add EXTENSIONS.md file at the root of the guidelines folder to avoid link breakage

usarid · usarid · commit 2070f3c3afae · 2017-07-25T11:47:57.000-07:00
diff --git a/guidelines/EXTENSIONS.md b/guidelines/EXTENSIONS.md
@@ -0,0 +1 @@
+For OpenAPI Specification version 2.0, please see [v2.0/EXTENSIONS.md](v2.0/EXTENSIONS.md)

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	`1`	`+For OpenAPI Specification version 2.0, please see [v2.0/EXTENSIONS.md](v2.0/EXTENSIONS.md)`