add create controller and dummy view

app/controllers/transactions_controller.rb

@@ -9,6 +9,10 @@ class TransactionsController < ApplicationController
   end
 
   def create
+    creditor = User.find params.require(:transaction).require(:creditor)
+    debtor = current_user
+    amount = params.require(:transaction).require(:amount)
+    @transaction = Transaction.create debtor: debtor, creditor: creditor, amount: amount, origin: I18n.t('origin.created_by_user'), message: "Transaction by #{debtor.name} to #{creditor.name}"
   end
 
 end

app/views/transactions/create.html.haml

@@ -0,0 +1,17 @@
+%table
+  %tbody
+    %tr
+      %th Debtor
+      %td= @transaction.debtor.name
+    %tr
+      %th Creditor
+      %td= @transaction.creditor.name
+    %tr
+      %th Amount
+      %td= @transaction.amount
+    %tr
+      %th Origin
+      %td= @transaction.origin
+    %tr
+      %th Message
+      %td= @transaction.message

config/locales/en.yml

@@ -20,4 +20,6 @@
 # available at http://guides.rubyonrails.org/i18n.html.
 
 en:
-  hello: "Hello world"
+  origin:
+    created_by_user: "User"
+