Add design doc and PR template (#329)

* Add design doc and pr request template

* Address comments and discussion points.

Author: PaulHigin

.github/PULL_REQUEST_TEMPLATE.md

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+<!-- Anything that looks like this is a comment and can't be seen after the Pull Request is created. -->
+
+# PR Summary
+
+<!-- Summarize your PR between here and the checklist. -->
+
+## PR Context
+
+<!-- Provide a little reasoning as to why this Pull Request helps and why you have opened it. -->
+
+## PR Checklist
+
+- [ ] [PR has a meaningful title](https://github.com/PowerShell/PowerShell/blob/master/.github/CONTRIBUTING.md#pull-request---submission)
+    - Use the present tense and imperative mood when describing your changes
+- [ ] [Summarized changes](https://github.com/PowerShell/PowerShell/blob/master/.github/CONTRIBUTING.md#pull-request---submission)
+- [ ] [Make sure all `.h`, `.cpp`, `.cs`, `.ps1` and `.psm1` files have the correct copyright header](https://github.com/PowerShell/PowerShell/blob/master/.github/CONTRIBUTING.md#pull-request---submission)
+- [ ] This PR is ready to merge and is not [Work in Progress](https://github.com/PowerShell/PowerShell/blob/master/.github/CONTRIBUTING.md#pull-request---work-in-progress).
+    - If the PR is work in progress, please add the prefix `WIP:` or `[ WIP ]` to the beginning of the title (the `WIP` bot will keep its status check at `Pending` while the prefix is present) and remove the prefix when the PR is ready.
+- **[Breaking changes](https://github.com/PowerShell/PowerShell/blob/master/.github/CONTRIBUTING.md#making-breaking-changes)**
+    - [ ] None
+    - **OR**
+    - [ ] [Documentation needed]()
+        - [ ] Issue filed: <!-- Number/link of that issue here -->
+- **User-facing changes**
+    - [ ] Not Applicable
+    - **OR**
+    - [ ] [Documentation needed]()
+        - [ ] Issue filed: <!-- Number/link of that issue here -->
+- **Testing - New and feature**
+    - [ ] N/A or can only be tested interactively
+    - **OR**
+    - [ ] [Make sure you've added a new test if existing tests do not effectively test the code changed](https://github.com/PowerShell/PowerShell/blob/master/.github/CONTRIBUTING.md#before-submitting)
+- **Tooling**
+    - [ ] I have considered the user experience from a tooling perspective and don't believe tooling will be impacted.
+    - **OR**
+    - [ ] I have considered the user experience from a tooling perspective and enumerated concerns in the summary.

Docs/DesignDoc.md

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+# PowerShellGet V3 Module Design
+
+## Description
+
+PowerShellGet V3 is an upgrade to the currently available V2 module.
+The V2 module is completely script based, and has dependencies on other PowerShell modules(PackageManagement).  
+
+This version directly uses NuGet APIs, via NuGet managed code binaries.  
+
+For more information, see [Re-architecting PowerShellGet - the PowerShell package manager](https://github.com/PowerShell/PowerShell-RFC/pull/185).  
+
+## Goals
+
+- Works side by side with current PowerShellGet V2 module
+
+- Remove dependency on PackageManagement module, and directly use NuGet APIs
+
+- Leverage the latest NuGet V3 APIs
+
+- Provide cmdlets that perform similar functions but do not interfere with V2 cmdlets
+
+- Implement as binary cmdlets and minimize use of PowerShell scripts
+
+- Remove unneeded components (DscResources).  TODO: Discuss with Sydney and Steve.
+
+- Minimize binary dependencies
+
+- Work over all PowerShell supported platforms
+
+- Minimize code duplication
+
+- Have only one .NET dependency (netstandard2.0) for Windows 5.x compatibility
+
+## Compatibility Module
+
+### Update module as needed
+
+### Write/update tests as needed
+
+## Summary of work estimates
+
+### Cmdlet work estimates
+
+TODO:
+
+### Compatibility Module work estimates
+
+TODO:
+
+## Cmdlets
+
+### Find-PSResource
+
+[Find-PSResource](./FindPSResource.md)
+
+### Get-PSResource
+
+### Get-PSResourceRepository
+
+### Install-PSResource
+
+### Publish-PSResource
+
+### Register-PSResourceRepository
+
+### Save-PSResource
+
+### Set-PSResourceRepository
+
+### Uninstall-PSResource
+
+### Unregister-PSResourceRepository
+
+### Update-PSResource