Create README.md

Author: EliteAsian123

README.md

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+# stdlib
+The standard library for [Scope](https://github.com/ScopeLang/Scope).
+
+# Building
+Make sure [Scope](https://github.com/ScopeLang/Scope) is properly installed.
+
+```bash
+# In the repo's directory
+$ scope build
+```