added manage_docs.py and docs folder

docs/openapi_first/app.md

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+# App
+
+::: openapi_first.app

docs/openapi_first/binder.md

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+# Binder
+
+::: openapi_first.binder

docs/openapi_first/errors.md

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+# Errors
+
+::: openapi_first.errors

docs/openapi_first/index.md

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+# Openapi First
+
+::: openapi_first

docs/openapi_first/loader.md

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+# Loader
+
+::: openapi_first.loader