Update README.md

Author: zaucy

README.md

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+	<img src="https://ecsact.dev/external/ecsact_logo/ecsact-color.png" width="300" />
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 # Ecsact SDK
 
-This repository is the source code for the Ecsact SDK that gets distributed to various platforms.
+This repository contains the Ecsact CLI and scripts for creating our releases. Majority of source code is in our [other repositories](https://github.com/orgs/ecsact-dev/repositories).
+
+## Ecsact Documentation and Guides
+
+Documentation is all on https://ecsact.dev
+
+* [Getting started / installation](https://ecsact.dev/start)
+* [Writing your first Ecsact file](https://ecsact.dev/start/tutorials/first-ecsact-file)
+* [Escact Language](https://ecsact.dev/docs/lang)
+* and more https://ecsact.dev/docs/overview
+
+## Core repositories
+
+Here are some core repositories that are most interesting if you're considering contributing or understanding Ecsact at a deeper level than the documentation.
+
+* https://github.com/ecsact-dev/ecsact_runtime
+* https://github.com/ecsact-dev/ecsact_parse
+* https://github.com/ecsact-dev/ecsact_interpret
+* https://github.com/ecsact-dev/ecsact_rt_entt
+* https://github.com/ecsact-dev/ecsact_si_wasm