add readme

LICENSE

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+MIT License
+
+Copyright (c) 2022 Arthur Wendling, Tarides
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+**Try it online at [doc.sherlocode.com](https://doc.sherlocode.com) !**
+
+A rough prototype of a Hoogle-like search engine for OCaml documentation. It's full of bugs and todos, but works well enough for my purpose: Perhaps it will be useful to you too.
+- The fuzzy type search is supported by a polarity search. As an example, the type `string -> int -> char` gets simplified to `{ -string, -int, +char }` which means that it consumes a `string` and an `int` and produces a `char` (irrespective of the order of the arguments). This yields good search results, but the sorting could be improved.
+- The real magic is all the package documentation generated for [`ocaml.org/packages`](https://ocaml.org/packages), which I got my hands on thanks to insider trading (but don't have the bandwidth to share back... sorry!)
+
+```
+$ opam install --deps-only ./sherlodoc.opam
+    # Note: your odoc version must match your odocl files
+
+# To index all the odocl files in `/path/to/doc`:
+$ dune exec -- ./index/index.exe /path/to/doc /path/to/result.db
+    # `/path/to/doc` should contain a hierarchy of subfolders `libname/1.2.3/**/*.odocl`
+    # `result.db` will be created or replaced
+
+# To run the website:
+$ dune exec -- ./www/www.exe /path/to/result.db
+22.10.22 17:17:33.102                       Running at http://localhost:1234
+```