Created Bridges (markdown)

Bridges.md

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+## Bridge Registration
+
+1. [Follow instructions for setting up your bridge](https://docs.mau.fi/bridges/python/setup.html). This should produce a `registration.yaml` file. 
+
+2. Convert the `registration.yaml` to `registration.json` using a yaml2json converter such as `apt-get install reserialize` or a website.
+
+```
+reserialize yaml2json registration.yaml > registration.json
+```
+
+3. Open the [Console](https://github.com/matrix-construct/construct/wiki/Useful-console-command-examples) to enter the following command:
+
+```
+> bridge set /path/to/registration.json
+```
+
+- If the bridge has already been registered then configuration will be updated.
+
+4. The bridge module may have to be reloaded `mod reload m_bridge` in the console to take effect.