Update README.md

Added status badges.

Author: Skyluker4

README.md

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 # UnityAssetReplacer
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+[![Build](https://github.com/Skyluker4/UnityAssetReplacer/actions/workflows/build.yml/badge.svg)](https://github.com/Skyluker4/UnityAssetReplacer/actions/workflows/build.yml)
+[![CodeQL](https://github.com/Skyluker4/UnityAssetReplacer/actions/workflows/codeql-analysis.yml/badge.svg)](https://github.com/Skyluker4/UnityAssetReplacer/actions/workflows/codeql-analysis.yml)
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 A tool to replace files in a Unity Asset Bundle from given files.