Added comments

Author: Tomas Bezouska

src/Firebase/Query/FilterQuery.cs

@@ -1,25 +1,44 @@
 namespace Firebase.Database.Query 
 {
     /// <summary>
-    /// Represents a firebase filtering query, e.g. "?LimitToLast=10"
+    /// Represents a firebase filtering query, e.g. "?LimitToLast=10".
     /// </summary>
     public class FilterQuery : ParameterQuery 
     {
         private readonly string value;
         private readonly double? doubleValue;
 
+        /// <summary>
+        /// Initializes a new instance of the <see cref="FilterQuery"/> class.
+        /// </summary>
+        /// <param name="parent"> The parent. </param>
+        /// <param name="filter"> The filter. </param>
+        /// <param name="value"> The value for filter. </param>
+        /// <param name="client"> The owning client. </param>  
         public FilterQuery(FirebaseQuery parent, string filter, string value, FirebaseClient client)
             : base(parent, filter, client)
         {
             this.value = value;
         }
 
+        /// <summary>
+        /// Initializes a new instance of the <see cref="FilterQuery"/> class.
+        /// </summary>
+        /// <param name="parent"> The parent. </param>
+        /// <param name="filter"> The filter. </param>
+        /// <param name="value"> The value for filter. </param>
+        /// <param name="client"> The owning client. </param>
         public FilterQuery(FirebaseQuery parent, string filter, double value, FirebaseClient client)
             : base(parent, filter, client)
         {
             this.doubleValue = value;
         }
 
+        /// <summary>
+        /// The build url parameter.
+        /// </summary>
+        /// <param name="child"> The child. </param> 
+        /// <returns> Url parameter part of the resulting path. </returns> 
         protected override string BuildUrlParameter(FirebaseQuery child)
         {
             if (this.value != null)

src/Firebase/Query/OrderQuery.cs

@@ -1,18 +1,29 @@
 namespace Firebase.Database.Query
 {
     /// <summary>
-    /// Represents a firebase ordering query, e.g. "?OrderBy=Foo"
+    /// Represents a firebase ordering query, e.g. "?OrderBy=Foo".
     /// </summary>
     public class OrderQuery : ParameterQuery
     {
         private readonly string propertyName;
 
+        /// <summary>
+        /// Initializes a new instance of the <see cref="OrderQuery"/> class.
+        /// </summary>
+        /// <param name="parent"> The query parent. </param>
+        /// <param name="propertyName"> The property name. </param>
+        /// <param name="client"> The owning client. </param>
         public OrderQuery(ChildQuery parent, string propertyName, FirebaseClient client)
             : base(parent, "orderBy", client)
         {
             this.propertyName = propertyName;
         }
 
+        /// <summary>
+        /// The build url parameter.
+        /// </summary>
+        /// <param name="child"> The child. </param>
+        /// <returns> The <see cref="string"/>. </returns>
         protected override string BuildUrlParameter(FirebaseQuery child)
         {
             return $"\"{this.propertyName}\"";

src/Firebase/Query/ParameterQuery.cs

@@ -1,25 +1,41 @@
 namespace Firebase.Database.Query
 {
     /// <summary>
-    /// Represents a parameter in firebase query, e.g. "?data=foo"
+    /// Represents a parameter in firebase query, e.g. "?data=foo".
     /// </summary>
     public abstract class ParameterQuery : FirebaseQuery
     {
         private readonly string parameter;
         private readonly string separator;
 
+        /// <summary>
+        /// Initializes a new instance of the <see cref="ParameterQuery"/> class.
+        /// </summary>
+        /// <param name="parent"> The parent of this query. </param>
+        /// <param name="parameter"> The parameter. </param>
+        /// <param name="client"> The owning client. </param>
         protected ParameterQuery(FirebaseQuery parent, string parameter, FirebaseClient client)
             : base(parent, client)
         {
             this.parameter = parameter;
             this.separator = (this.Parent is ChildQuery) ? "?" : "&";
         }
 
+        /// <summary>
+        /// Build the url segment represented by this query. 
+        /// </summary> 
+        /// <param name="child"> The child. </param>
+        /// <returns> The <see cref="string"/>. </returns>
         protected override string BuildUrlSegment(FirebaseQuery child)
         {
             return $"{this.separator}{this.parameter}={this.BuildUrlParameter(child)}";
         }
 
+        /// <summary>
+        /// The build url parameter.
+        /// </summary>
+        /// <param name="child"> The child. </param>
+        /// <returns> The <see cref="string"/>. </returns>
         protected abstract string BuildUrlParameter(FirebaseQuery child);
     }
 }