add remote doc

remote-release-notes/v1_77.md

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+# Maarch 2023 (version 1.77)
+
+## Core
+
+### Install additional builtin extensions via VSIX
+
+VS Code Server now supports installing additional builtin extensions via VSIX. This is useful if the remote setup has VSIX files already available and you want to install them without having to reach out to the marketplace thereby improving the startup time. This helped Codespaces startup to be faster by ~125%.