Add deployment instructions

Author: hoshildharmendra

_docs/deployment-instructions.md

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+# Deployment Instructions
+
+## Requirements
+
+You will need the following to run this application:
+1. Server running MySQL version 14.14
+1. Java version 1.8
+
+## Installation
+
+Setup the MySQL database.
+
+```bash
+mysql -u USERNAME -h HOSTNAME -P PORT -p -e "create database groupthree" 
+```
+
+## Configure GitLab OAuth2
+
+Follow the instructions provided on this [website](https://docs.gitlab.com/ee/integration/oauth_provider.html). Set the callback URL to `http://{DOMAIN_NAME}/login/oauth2/code/gitlab`, replacing {DOMAIN_NAME} with the appropriate domain name.
+
+
+## Configure application.yml
+
+This file contains the properties of the deployment of the application.
+Create a new file `application.yml` with the following contents, replacing {} with the appropriate details:
+
+`{HOSTNAME}` = Hostname of the sql server e.g. mysql.mcscw3.le.ac.uk  
+`{PORT}` = Port of the sql server e.g. 3306  
+`{USERNAME}` = Username for the sql server  
+`{PASSWORD}` = Password for the sql server  
+`{CLIENT_ID}` = GitLab Application Id  
+`{CLIENT_SECRET}` = GitLab Secret  
+`{PORT_NUMBER}` = Port you would like the application to run on  
+
+
+```yaml
+spring:
+  datasource:
+    platform: mysql
+    url: jdbc:mysql://{HOSTNAME}:{PORT}/groupthree
+    username: {USERNAME}
+    password: {PASSWORD}
+    driverClassName: com.mysql.jdbc.Driver
+  jpa:
+    hibernate: 
+      ddl-auto: create
+    properties:
+      hibernate:
+        dialect: org.hibernate.dialect.MySQL5InnoDBDialect
+  mvc:
+    view:
+      prefix: /WEB-INF/views/
+      suffix: .jsp
+  security:
+    oauth2:
+      client:
+        registration:
+          gitlab:
+            client-id: {CLIENT_ID}
+            client-secret: {CLIENT_SECRET}
+            authorization-grant-type: authorization_code
+            # Below property should not be changed
+            redirect-uri-template: '{baseUrl}/login/oauth2/code/{registrationId}'
+            scope: openid
+            clientName: GitLab
+        provider:
+          gitlab:
+            authorization-uri: https://gitlab.com/oauth/authorize   
+            token-uri: https://gitlab.com/oauth/token
+            user-info-uri: https://gitlab.com/api/v4/user
+            jwk-set-uri: https://gitlab.com/oauth/discovery/keys
+server:
+  port: {PORT_NUMBER}
+```
+
+## Run the application
+
+```bash
+java -jar /path/to/co2015-1819-group-03-0.0.1-SNAPSHOT.war --spring.config.location=file:relative/path/to/application.yml
+```