Add REPL sample

Author: gilzoide

.gitignore

@@ -1,2 +1,4 @@
 *.o
 *.o~
+Samples
+Samples.meta

Samples~/REPL.meta

@@ -0,0 +1,16 @@
+{
+    "name": "Gilzoide.SqliteNet.Samples.REPL",
+    "rootNamespace": "",
+    "references": [
+        "Gilzoide.SqliteNet"
+    ],
+    "includePlatforms": [],
+    "excludePlatforms": [],
+    "allowUnsafeCode": false,
+    "overrideReferences": false,
+    "precompiledReferences": [],
+    "autoReferenced": false,
+    "defineConstraints": [],
+    "versionDefines": [],
+    "noEngineReferences": false
+}

Samples~/REPL/Gilzoide.SqliteNet.Samples.REPL.asmdef

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+using System;
+using System.Text;
+using SQLite;
+using UnityEngine;
+using UnityEngine.UI;
+
+namespace Gilzoide.SqliteNet.Samples.REPL
+{
+    public class SQLiteREPL : MonoBehaviour
+    {
+        public string DbName = "SQLiteREPL.sqlite";
+        public Text OutputText;
+
+        private SQLiteConnection _connection;
+
+        void Start()
+        {
+            _connection = new SQLiteConnection(DbName);
+        }
+
+        void OnDestroy()
+        {
+            _connection?.Dispose();
+        }
+
+        public void OnSubmitSQL(string sql)
+        {
+            DateTime timeBefore = DateTime.Now;
+            try
+            {
+                using (var stmt = new SQLitePreparedStatement(_connection, sql))
+                {
+                    var sb = new StringBuilder();
+                    sb.Append(string.Join("|", stmt.EnumerateColumnNames()));
+                    if (sb.Length > 0)
+                    {
+                        sb.Append('\n');
+                        for (int i = 0, count = sb.Length; i < count; i++)
+                        {
+                            sb.Append('-');
+                        }
+                    }
+                    while (true)
+                    {
+                        switch (stmt.Step())
+                        {
+                            case SQLite3.Result.Row:
+                            {
+                                sb.Append('\n');
+                                sb.Append(string.Join("|", stmt.EnumerateColumnsAsText()));
+                                break;
+                            }
+                            
+                            case SQLite3.Result.Done:
+                                goto breakwhile;
+                        }
+                    }
+                breakwhile:
+                    OutputText.text = sb.Length > 0 ? sb.ToString() : "OK";
+                }
+            }
+            catch (SQLiteException ex)
+            {
+                OutputText.text = "Error: " + ex.Message;
+            }
+
+            DateTime timeAfter = DateTime.Now;
+            TimeSpan timeSpent = timeAfter - timeBefore;
+            OutputText.text += $"\n\nTook: {timeSpent.TotalMilliseconds}ms";
+        }
+    }
+}