Add empty files for extensions structure in docs

docs/supporting/requirements.md

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+# Requirements for Lens
+
+## Hardware
+
+Lens is a small download (< 300 MB) and has a disk footprint of 600 MB. Lens is lightweight and should easily run on today's hardware.
+
+We recommend:
+
+* 2 GHz or faster processor
+* 1 GB of RAM
+
+## Platforms
+
+Lens has been tested on the following platforms:
+
+* OS X
+* Windows
+* Linux
+
+### Additional Windows requirements
+
+...
+
+### Additional Linux requirements
+
+...