Initial QSfera import

Server/vendor/github.com/agnivade/levenshtein/README.md

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+levenshtein ![Build Status](https://github.com/agnivade/levenshtein/actions/workflows/ci.yml/badge.svg) [![Go Report Card](https://goreportcard.com/badge/github.com/agnivade/levenshtein)](https://goreportcard.com/report/github.com/agnivade/levenshtein) [![PkgGoDev](https://pkg.go.dev/badge/github.com/agnivade/levenshtein)](https://pkg.go.dev/github.com/agnivade/levenshtein)
+===========
+
+[Go](http://golang.org) package to calculate the [Levenshtein Distance](http://en.wikipedia.org/wiki/Levenshtein_distance)
+
+The library is fully capable of working with non-ascii strings. But the strings are not normalized. That is left as a user-dependant use case. Please normalize the strings before passing it to the library if you have such a requirement.
+- https://blog.golang.org/normalization
+
+#### Limitation
+
+As a performance optimization, the library can handle strings only up to 65536 characters (runes). If you need to handle strings larger than that, please pin to version 1.0.3.
+
+Install
+-------
+
+    go get github.com/agnivade/levenshtein
+
+Example
+-------
+
+```go
+package main
+
+import (
+	"fmt"
+	"github.com/agnivade/levenshtein"
+)
+
+func main() {
+	s1 := "kitten"
+	s2 := "sitting"
+	distance := levenshtein.ComputeDistance(s1, s2)
+	fmt.Printf("The distance between %s and %s is %d.\n", s1, s2, distance)
+	// Output:
+	// The distance between kitten and sitting is 3.
+}
+
+```
+
+Benchmarks
+----------
+
+```
+name              time/op
+Simple/ASCII-4     330ns ± 2%
+Simple/French-4    617ns ± 2%
+Simple/Nordic-4   1.16µs ± 4%
+Simple/Tibetan-4  1.05µs ± 1%
+
+name              alloc/op
+Simple/ASCII-4     96.0B ± 0%
+Simple/French-4     128B ± 0%
+Simple/Nordic-4     192B ± 0%
+Simple/Tibetan-4    144B ± 0%
+
+name              allocs/op
+Simple/ASCII-4      1.00 ± 0%
+Simple/French-4     1.00 ± 0%
+Simple/Nordic-4     1.00 ± 0%
+Simple/Tibetan-4    1.00 ± 0%
+```
+
+Comparisons with other libraries
+--------------------------------
+
+```
+name                     time/op
+Leven/ASCII/agniva-4      353ns ± 1%
+Leven/ASCII/arbovm-4      485ns ± 1%
+Leven/ASCII/dgryski-4     395ns ± 0%
+Leven/French/agniva-4     648ns ± 1%
+Leven/French/arbovm-4     791ns ± 0%
+Leven/French/dgryski-4    682ns ± 0%
+Leven/Nordic/agniva-4    1.28µs ± 1%
+Leven/Nordic/arbovm-4    1.52µs ± 1%
+Leven/Nordic/dgryski-4   1.32µs ± 1%
+Leven/Tibetan/agniva-4   1.12µs ± 1%
+Leven/Tibetan/arbovm-4   1.31µs ± 0%
+Leven/Tibetan/dgryski-4  1.16µs ± 0%
+```