Adding ref MD content

Author: suramam

reference/sharepoint-framework-reference.md

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 # SharePoint Framework Reference
-The SharePoint Framework object model is built in TypeScript. to learn more about the classes, methods, and other types available for building your SharePoint Framework solutions, see the [SharePoint Framework reference](https://sharepoint.github.io/).
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+## Modules
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+| Module	   | Description|
+|:-------------|:-------|
+|[sp-client-base](./spfx/sp-client-base-module.md)||
+|[sp-client-preview](./spfx/sp-client-preview-module.md)||
+|[sp-module-interfaces](./spfx/sp-module-interfaces-module.md)||
+|[typings/es6-collections](./spfx/es6-collections-module.md)||
+|[typings/es6-promise](./spfx/es6-promise-module.md)||
+|[typings/whatwg-fetch](./spfx/whatwg-fetch-module.md)||

reference/spfx/'es6-promise'-imodule.md

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+# 'es6-promise' module
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+## Variables
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+| Variable	   |  Description|
+|:-------------|:----|
+|foo      |   |
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