DevFabric setup instructions

SetupPortfolioPlansDevFabric.md

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+## Setting up Dev environment for Portfolio Plans
+
+1. Clone repo, and install dev pre-requisites. See [README file](README.md) for details.
+2. Deploy devfabric with Analytics support
+```
+vssdf sps gallery commerce ems gallery tfs ax
+```
+3. Enable feature flag to enable `Descendants` support in OData service `3.0-preview`. Enable FF in the Analytics service configuration database.
+
+```
+use [Analytics_Configuration]
+go
+exec prc_SetRegistryValue 1, '#\FeatureAvailability\Entries\Analytics.Transform.WorkItemDescendants\AvailabilityState\', 1
+```
+
+4. `iisreset`
+5. Build code with `webpack`
+```
+.\node_modules\.bin\webpack
+```
+6. Run packaging for DevFabric environment
+```
+npm run package:dev
+```
+7. Run dev https server for sources in DevFabric environment:
+```
+npm run dev
+```
+8. Create a new publisher called **ms-devlabs** in your devfabric deployment.
+9. Upload `.vsix` package as a new extension for **ms-devlabs** publisher.
+10. Share the newly-uploaded extension with your devfabric organization.
+11. Go to your devfabric organization's shared extensions, and install it.
+12. `Portfolio Plans` hub should appear in the `Boards` hub group.