add readme and detect if object is door

README.md

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+<h1 align="center">d2go</h1>
+
+---
+
+Tooling for Diablo II: Resurrected written in Go. It provides a library to read game memory and a public SDK to be
+imported, along with data structures and some other tools.
+
+### Libraries
+
+- [data](https://github.com/hectorgimenez/d2go/tree/main/pkg/data) - D2R Game data structures
+- [memory](https://github.com/hectorgimenez/d2go/tree/main/pkg/memory) - D2R memory reader (it provides the data
+  structures)
+- [nip](https://github.com/hectorgimenez/d2go/tree/main/pkg/nip) - A very basic NIP file parser
+- [itemfilter](https://github.com/hectorgimenez/d2go/tree/main/pkg/itemfilter) - Based on game data, it provides an item
+  pickup filtering
+
+### Tools
+
+- [cmd/itemwatcher](https://github.com/hectorgimenez/d2go/tree/main/cmd/itemwatcher) - Small tool that plays a sound
+  when an item passing the filtering process is dropped