Created Pre-built binaries (markdown)

Pre-built-binaries.md

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+bitwarden_rs doesn't currently provide standalone binaries as a separate download, but for platforms that have an Alpine-based Docker image available (currently x86-64 and ARMv7), you can extract standalone, statically-linked binaries from the official Docker images. Each Docker image also includes a matching web vault build (which is platform-independent).
+
+## Extracting binaries with Docker installed
+
+Assuming you want to extract binaries for the platform you're running on:
+```
+docker pull bitwardenrs/server:alpine
+docker create --name bwrs bitwardenrs/server:alpine
+docker cp bwrs:/bitwarden_rs .
+docker cp bwrs:/web-vault .
+docker rm bwrs
+```
+
+If you want binaries for a different platform (for example, you only have Docker installed on your x86-64 machine, but you want to run bitwarden_rs on a Raspberry Pi), add the `--platform` option to the `docker pull` command:
+```
+docker pull --platform linux/arm/v7 bitwardenrs/server:alpine
+# Run remaining commands as above.
+# Note that the `docker create` command may print a message like:
+#   WARNING: The requested image's platform (linux/arm/v7) does not match the detected host platform (linux/amd64)
+#   and no specific platform was requested
+# This is expected, and isn't cause for concern.
+```
+
+## Extracting binaries without Docker installed
+
+TODO