Created Updating (markdown)

Updating.md

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+Updating an existing installation is very simple, depending on your type of installation.
+
+## Release Build
+
+* Download latest version
+* Extract all files
+* Replace existing files
+
+This will update all core files to the latest version. Your custom configuration and bridges are left untouched. Keep in mind that changes to any core file of RSS-Bridge will be replaced.
+
+## Docker
+
+Simply get the latest Docker build via `:latest` or specific builds via `:<tag-name>`.
+
+## Git
+
+To get the latest changes from the master branch
+
+```
+git pull
+```
+
+To use a specific tag
+
+```
+git fetch --all
+git checkout tags/<tag-name>
+```