Merge pull request #1126 from mattermost/upgrade-guide

Create Upgrade-Guide.md

doc/install/Upgrade-Guide.md

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+# Mattermost Upgrade Guide
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+### Upgrading Mattermost v0.7 to v1.1
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+If you've manually changed Mattermost v0.7 configuration by updating the `config.json` file, you'll need to port those changes to Mattermost v1.1: 
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+1. Go to the `config.json` file that you manually updated and note any differences from the [default `config.json` file in Mattermost 0.7](https://github.com/mattermost/platform/blob/v0.7.0/config/config.json). 
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+2. For each setting that you changed, check [the changelog documentation](https://github.com/mattermost/platform/blob/master/CHANGELOG.md#configjson-changes-from-v07-to-v10) on whether the configuration setting has changed between v0.7 and v1.1
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+3. Update your new [`config.json` file in Mattermost v1.1](https://github.com/mattermost/platform/blob/v1.1.0/config/config.json), based on your preferences and the changelog documentation above. 
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+Optionally, you can use the new [System Console user interface](https://github.com/mattermost/platform/blob/master/doc/install/Configuration-Settings.md) to make changes to your new `config.json` file. 
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