Add database setup (#6)

Add basic dependencies and configuration for creating a simple database to store the currency exchange rates.

pom.xml

@@ -43,11 +43,31 @@
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-web</artifactId>
         </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-data-jpa</artifactId>
+        </dependency>
+
+        <dependency>
+            <groupId>org.postgresql</groupId>
+            <artifactId>postgresql</artifactId>
+        </dependency>
 
+        <dependency>
+            <groupId>org.hibernate.orm</groupId>
+            <artifactId>hibernate-core</artifactId>
+        </dependency>
+
+        <!--These libraries are only used for testing purposes, doesn't need to be in the final produced jar-->
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-test</artifactId>
-            <!--The library is only used for testing purposes, doesn't need to be in the final produced jar-->
+            <scope>test</scope>
+        </dependency>
+        <!--In memory database for testing-->
+        <dependency>
+            <groupId>com.h2database</groupId>
+            <artifactId>h2</artifactId>
             <scope>test</scope>
         </dependency>
     </dependencies>

src/main/resources/application.yaml

@@ -8,12 +8,19 @@ spring:
   logging:
     level:
       org.springframework: DEBUG
+  datasource:
+    url: jdbc:postgresql://localhost:5432/currency_exchange
+    username: postgres
+    password: postgres
+  jpa.hibernate.ddl-auto: create
+  jpa.properties.hibernate.dialect: org.hibernate.dialect.PostgreSQLDialect
 external:
   api:
     exchange_rate:
       uri: http://localhost:8081
       token: "dummy-token"
 
+
 # Configuration for the "production" profile
 ---
 spring:
@@ -23,6 +30,12 @@ spring:
   logging:
     level:
       org.springframework: INFO
+  datasource:
+    url: jdbc:postgresql://localhost:5432/currency_exchange
+    username: postgres
+    password: postgres
+  jpa.hibernate.ddl-auto: create
+  jpa.properties.hibernate.dialect: org.hibernate.dialect.PostgreSQLDialect
 external:
   api:
     exchange_rate: