docs: describe the library's purpose and basic usage example

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README.md

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+# Majority Judgment for Golang
+
+> WORK IN PROGRESS
+
+A Go library to deliberate using Majority Judgment.
+
+We use a score-based algorithm, for performance and scalability.
+
+Supports billions of judgments and thousands of proposals per poll, if need be.
+
+
+## Installation
+
+    go get -u github.com/mieuxvoter/judgment
+
+
+## Usage
+
+```go
+
+package main
+
+import (
+	"fmt"
+	"log"
+
+	"github.com/mieuxvoter/judgment"
+)
+
+func main() {
+
+    poll := &judgment.PollTally{
+        AmountOfJudges: 10,
+        Proposals: []*judgment.ProposalTally{
+            {Tally: []uint64{2, 2, 2, 2, 2}}, // Proposal A   Amount of judgments received for each grade,
+            {Tally: []uint64{2, 1, 1, 1, 5}}, // Proposal B   from "worst" grade to "best" grade.
+            {Tally: []uint64{2, 1, 1, 2, 4}}, // Proposal C   Make sure all tallies are balanced, that is they
+            {Tally: []uint64{2, 1, 5, 0, 2}}, // Proposal D   hold the same total amount of judgments.
+            // …
+        },
+    }
+    deliberator := &judgment.MajorityJudgment{}
+    result, err := deliberator.Deliberate(poll)
+
+    if nil != err {
+        log.Fatalf("Deliberation failed: %v", err)
+    }
+
+    fmt.Printf("Result: %v\n", result) // proposals results are ordered like tallies, but Rank is available 
+
+}
+
+```
+
+
+## License
+
+`MIT`