adding more comments to respective portions of code

ExpenseTracker.Android/ExpenseTracker.Android.csproj

@@ -169,5 +169,8 @@
   <ItemGroup>
     <AndroidResource Include="Resources\drawable\background.jpg" />
   </ItemGroup>
+  <ItemGroup>
+    <AndroidResource Include="Resources\drawable\avatar.png" />
+  </ItemGroup>
   <Import Project="$(MSBuildExtensionsPath)\Xamarin\Android\Xamarin.Android.CSharp.targets" />
 </Project>

ExpenseTracker.sln

@@ -7,7 +7,7 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ExpenseTracker.Android", "E
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ExpenseTracker.iOS", "ExpenseTracker.iOS\ExpenseTracker.iOS.csproj", "{A3054586-0D0F-4EA0-9BFD-39E48715C6B7}"
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ExpenseTracker", "ExpenseTracker\ExpenseTracker.csproj", "{C39DA104-B647-405A-9934-91A9E9553D1D}"
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "ExpenseTracker", "ExpenseTracker\ExpenseTracker.csproj", "{C39DA104-B647-405A-9934-91A9E9553D1D}"
 EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution

ExpenseTracker/model/CatergoryAmount.cs

@@ -4,6 +4,7 @@ using System.Text;
 
 namespace ExpenseTracker.model
 {
+    //this class specifies each category with it's total amount by an ID
     class CatergoryAmount
     {
 

ExpenseTracker/model/ExpenseCategory.cs

@@ -4,7 +4,7 @@ using System.Text;
 
 namespace ExpenseTracker.model
 {
-    //this model describes the type of data to be taken for each expense category
+    //this model describes the type of data to be taken(per user) for each expense category
    public class ExpenseCategory
     {
         public int id { get; set; }

ExpenseTracker/model/SideDrawerMenu.cs

@@ -4,6 +4,7 @@ using System.Text;
 
 namespace ExpenseTracker.model
 {
+    //
     class SideDrawerMenu
     {
 

ExpenseTracker/model/expense.cs

@@ -4,7 +4,7 @@ using System.Text;
 
 namespace ExpenseTracker.model
 {
-    //describes the type of data to be taken for expenses per user
+    //describes the type of data to be taken from the user  for expenses . This is tagged to a particular user
     class Expense
     {
         public int expenseCategory { get; set; }

ExpenseTracker/model/user.cs

@@ -4,6 +4,7 @@ using System.Text;
 
 namespace ExpenseTracker.model
 {
+    //describes the type of  data taken for user authentication
    public class Users
     {
         public string Email { get; set; }

ExpenseTracker/viewModel/FirebaseHelper.cs

@@ -14,7 +14,7 @@ namespace ExpenseTracker.viewModel
     {
         FirebaseClient firebase = new FirebaseClient("https://expensetracker-cdaa4.firebaseio.com");
 
-        //get all Expenses
+        //get all Expenses ; specifies a list of all the existing expenses for the user
         public async Task<List<Expense>> GetAllExpense(String usermail)
         {
 
@@ -31,7 +31,7 @@ namespace ExpenseTracker.viewModel
 
               }).Reverse().ToList();
         }
-        //all New Expense
+        //all New Expense; adds new expenses
         public async Task AddExpense(double amount, string narration, int expenseCategory, string id, String email)
         {
 
@@ -89,7 +89,7 @@ namespace ExpenseTracker.viewModel
 
 
 
-        //get all categories
+        //get all categories; specifies a list of all existing categories of expenses per user
         public async Task<List<ExpenseCategory>> GetAllCategory(String useremail)
         {
 
@@ -155,7 +155,7 @@ namespace ExpenseTracker.viewModel
         //Queries
 
 
-        //getting total amount of expenses
+        //getting total amount of all expenses
         public async Task<double> GetTotalAmountOfExpense(string email)
         {
             double totalAmount=0.0;

ExpenseTracker/views/home/HomePage.xaml

@@ -12,7 +12,7 @@ xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
                         <StackLayout Orientation="Vertical">
                             <StackLayout Orientation="Horizontal" Margin="5,50,5,5"
 BackgroundColor="White" HorizontalOptions="FillAndExpand">
-                                <Image Source="logo.png" BackgroundColor="Transparent" HeightRequest="100"
+                                <Image Source="avatar.png" BackgroundColor="Transparent" HeightRequest="100"
 WidthRequest="100" VerticalOptions="Center" />
 
                                 <StackLayout Orientation="Vertical">