Update README.md: Add a "cd FirefoxReality" (#1031)

This makes it clear that the rest of the instructions need to be executed inside the cloned directory. E.g. the third_party directory goes inside the FirefoxReality directory at the root.
MozillaReality · Mar 18, 2019 · bc5c435 · bc5c435
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diff --git a/README.md b/README.md
@@ -25,6 +25,7 @@ The L10n wiki page can be found [here](https://github.com/MozillaReality/Firefox
 
 ```bash
 git clone git@github.com:MozillaReality/FirefoxReality.git
+cd FirefoxReality
 ```
 
 *Clone the third-party repo.*