chore: add back deleted readmes (#17627)

docs/docs/build/packages/README.md

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+sidebar_position: 0
+---
+
+# Packages
+
+The Cosmos SDK is a collection of Go modules. This section provides documentation on various packages that can used when developing a Cosmos SDK chain.
+It lists all standalone Go modules that are part of the Cosmos SDK.
+
+:::tip
+For more information on SDK modules, see the [SDK Modules](https://docs.cosmos.network/main/modules) section.
+For more information on SDK tooling, see the [Tooling](https://docs.cosmos.network/main/tooling) section.
+:::
+
+## Core
+
+* [Core](https://pkg.go.dev/cosmossdk.io/core) - Core library defining SDK interfaces ([ADR-063](https://docs.cosmos.network/main/architecture/adr-063-core-module-api))
+* [API](https://pkg.go.dev/cosmossdk.io/api) - API library containing generated SDK Pulsar API
+* [Store](https://pkg.go.dev/cosmossdk.io/store) - Implementation of the Cosmos SDK store
+
+## State Management
+
+* [Collections](./02-collections.md) - State management library
+* [ORM](./03-orm.md) - State management library
+
+## Automation
+
+* [Depinject](./01-depinject.md) - Dependency injection framework
+* [Client/v2](https://pkg.go.dev/cosmossdk.io/client/v2) - Library powering [AutoCLI](https://docs.cosmos.network/main/core/autocli)
+
+## Utilities
+
+* [Log](https://pkg.go.dev/cosmossdk.io/log) - Logging library
+* [Errors](https://pkg.go.dev/cosmossdk.io/errors) - Error handling library
+* [Math](https://pkg.go.dev/cosmossdk.io/math) - Math library for SDK arithmetic operations
+
+## Example
+
+* [SimApp](https://pkg.go.dev/cosmossdk.io/simapp) - SimApp is **the** sample Cosmos SDK chain. This package should not be imported in your application.

docs/docs/build/tooling/README.md

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+sidebar_position: 0
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+
+# Tools
+
+This section provides documentation on various tooling maintained by the SDK team.
+This includes tools for development, operating a node, and ease of use of a Cosmos SDK chain.
+
+## CLI Tools
+
+* [Cosmovisor](./01-cosmovisor.md)
+* [Confix](./02-confix.md)
+* [Hubl](./03-hubl.md)
+* [Rosetta](https://docs.cosmos.network/main/run-node/rosetta)
+
+## Other Tools
+
+* [Protocol Buffers](./00-protobuf.md)