Mini survey added.

Minor fiexes.

TINKLib/ViewModel/MiniSurvey/Question/CheckOneViewModel.cs

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+using System.Collections.Generic;
+using System.Linq;
+
+namespace TINK.ViewModel.MiniSurvey.Question
+{
+    public class CheckOneViewModel : IMiniSurveyQuestion
+    {
+        /// <summary> Constructs object. </summary>
+        /// <param name="question">Holds the question with key asked to user.</param>
+        /// <param name="answers">Holds the list of possible answers with their option keys.</param>
+        public CheckOneViewModel(
+            KeyValuePair<string, string> question,
+            Dictionary<string, string> answers)
+        {
+            Question = question; 
+            Answers = answers ?? new Dictionary<string, string>();
+        }
+
+        /// <summary> Holds the question with key asked to user. </summary>
+        public KeyValuePair<string, string> Question { get; }
+
+        /// <summary> Holds the question with key asked to user exposed to GUI. </summary>
+        public string QuestionText => Question.Value;
+
+        /// <summary> Holds the list of possible answers with their option keys. </summary>
+        public Dictionary<string, string> Answers { get; }
+
+        /// <summary> Holds the list of possible answers exposed to GUI. </summary>
+        public IEnumerable<string> AnswersText
+        {
+            get => Answers.Select(x => x.Value).ToList();
+            set => AnswersText = Answers.Select(x => x.Value).ToList();
+        }
+
+        /// <summary> Holds the users selected answer (one of answers) with its option key. </summary>
+        public KeyValuePair<string, string> Answer { get; private set; }
+
+        /// <summary> Holds the users selected answer (one of answers) in GUI. </summary>
+        public string AnswerText
+        {
+            get => Answer.Value;
+            set => Answer = Answers.FirstOrDefault(x => x.Value == value);
+        }
+    }
+}

TINKLib/ViewModel/MiniSurvey/Question/FreeTextViewModel.cs

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+using System.Collections.Generic;
+
+namespace TINK.ViewModel.MiniSurvey.Question
+{
+    public class FreeTextViewModel : IMiniSurveyQuestion
+    {
+        /// <summary> Constructs object. </summary>
+        /// <param name="question">Holds the question with key asked to user.</param>
+        /// <param name="answers">Holds the list of possible answers with their option keys.</param>
+        public FreeTextViewModel(
+            KeyValuePair<string, string> question)
+        {
+            Question = question;
+        }
+
+        /// <summary> Holds the question with key asked to user. </summary>
+        public KeyValuePair<string, string> Question { get; }
+
+        /// <summary> Holds the question with key asked to user exposed to GUI. </summary>
+        public string QuestionText => Question.Value;
+
+        /// <summary> Holds the users selected answer with its option key. </summary>
+        public KeyValuePair<string, string> Answer { get; private set; }
+
+        /// <summary> Holds the list of possible answers exposed to GUI. </summary>
+        public string AnswerText 
+        {
+            get => null;
+            set => Answer = new KeyValuePair<string, string>(value, null);
+        }
+    }
+}

TINKLib/ViewModel/MiniSurvey/Question/IMiniSurveyQuestion.cs

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+using System.Collections.Generic;
+
+namespace TINK.ViewModel.MiniSurvey.Question
+{
+    public interface IMiniSurveyQuestion
+    {
+        /// <summary> Holds the question with key asked to user. </summary>
+        KeyValuePair<string, string> Question { get; }
+
+        /// <summary> Holds the users selected answer with its option key. </summary>
+        KeyValuePair<string, string> Answer { get; }
+    }
+}