Add README

Author: CrazyPython

README.md

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+# `tree-query`
+
+Tree query is a tool that searches across indented lines.
+
+It is a replacement for Roam's query system.
+
+## Features
+
+This section is a work-in-progress.
+
+* **Fast**: Over 880Gbps on a MacBook Air
+
+## Contributing
+
+Tree-query is written in [Dlang](https://dlang.org) but don't let that put you off- if you know C, C++, or Java, you'll pick it up very quickly.
+
+If you have any questions on D, feel free to go to #d on freenode or D Forums. People are very nice.
+
+### Notes
+
+A string in D is a reference to a region of immutable memory. It is a length and a pointer. For this reason, it is is very efficient to copy.
+
+A struct is like a Java record or class.
+
+## Known bugs
+ - Mixing tabs and spaces is not supported, unless an explicit spaces per indent specified