Add comprehensive documentation with i18n support (EN/BG)

- Add docs/ folder with English (en/) and Bulgarian (bg/) documentation
- Create index.md with language switching and links
- English docs: installation, quickstart, architecture, baraql, storage,
  schema, lsm, btree, vector, graph, fts, columnar, transactions,
  distributed, protocol, udf, api-binary, api-http, api-websocket
- Bulgarian docs: installation, quickstart, architecture, baraql,
  schema, lsm, btree, vector, graph, fts, transactions, distributed
- Update README license to BSD 3-Clause
- Add LICENSE file with BSD 3-Clause text
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# Пълнотекстово Търсене
Инвертиран индекс с BM25 и TF-IDF ранжиране.
## Употреба
```nim
import barabadb/fts/engine
var idx = newInvertedIndex()
idx.addDocument(1, "Nim е бърз език за програмиране")
idx.addDocument(2, "Python е популярен за data science")
let results = idx.search("език програмиране")
let tfidf = idx.searchTfidf("език")
let fuzzy = idx.fuzzySearch("програмиране", maxDistance = 2)
```
## Методи за Ранжиране
### BM25
Най-добрият алгоритъм за съвпадение
### TF-IDF
Term Frequency-Inverse Document Frequency
## Търсене
| Тип | Описание |
|-----|----------|
| Fuzzy | Толерантност към правописни грешки |
| Wildcard | Префикс, суфикс, и инфикс заместващи символи |
| Regex | Регулярни изрази |