Merge pull request #19 from LuizHAP/feature/readme-changes

chore: add image on readme.md Closes #18.

Author: SuzeShardlow

.github/redisolar.png

@@ -1,5 +1,7 @@
 # RediSolar for Node.js
 
+![Preview of running application - Solar Site Map with markers](preview.png)
+
 # Introduction
 
 This is the sample application codebase for RU102JS, [Redis for JavaScript Developers](https://university.redis.com/courses/ru102js/) at [Redis University](https://university.redis.com).
@@ -10,15 +12,15 @@ Solutions to the course programming challenges can be found on the `solutions` b
 
 In order to start and run this application, you will need:
 
-* [Node.js](https://nodejs.org/en/download/) (8.9.4 or newer, we recommend using the current Long Term Stable version)
-* npm (installed with Node.js)
-* Access to a local or remote installation of [Redis](https://redis.io/download) version 5 or newer (local preferred)
-* If you want to try the RedisTimeSeries exercises, you'll need to make sure that your Redis installation also has the [RedisTimeSeries Module](https://oss.redis.com/redistimeseries/) installed
+- [Node.js](https://nodejs.org/en/download/) (8.9.4 or newer, we recommend using the current Long Term Stable version)
+- npm (installed with Node.js)
+- Access to a local or remote installation of [Redis](https://redis.io/download) version 5 or newer (local preferred)
+- If you want to try the RedisTimeSeries exercises, you'll need to make sure that your Redis installation also has the [RedisTimeSeries Module](https://oss.redis.com/redistimeseries/) installed
 
 If you're using Windows, check out the following resources for help with running Redis:
 
-* [Redis Labs Blog - Running Redis on Windows 10](https://redis.com/blog/redis-on-windows-10/)
-* [Microsoft - Windows Subsystem for Linux Installation Guide for Windows 10](https://docs.microsoft.com/en-us/windows/wsl/install-win10)
+- [Redis Labs Blog - Running Redis on Windows 10](https://redis.com/blog/redis-on-windows-10/)
+- [Microsoft - Windows Subsystem for Linux Installation Guide for Windows 10](https://docs.microsoft.com/en-us/windows/wsl/install-win10)
 
 # Setup
 
@@ -28,12 +30,12 @@ To get started:
 $ npm install
 ```
 
-# Configuration 
+# Configuration
 
-The application uses a configuration file, `config.json` to specify the port that it listens 
-on plus some logging parameters and how it connects to a database. 
+The application uses a configuration file, `config.json` to specify the port that it listens
+on plus some logging parameters and how it connects to a database.
 
-The supplied `config.json` file is already set up to use Redis on localhost port 6379.  Change these values if your Redis instance is on another host or port, or requires a password to connect.
+The supplied `config.json` file is already set up to use Redis on localhost port 6379. Change these values if your Redis instance is on another host or port, or requires a password to connect.
 
 ```
 {
@@ -53,8 +55,8 @@ The supplied `config.json` file is already set up to use Redis on localhost port
 }
 ```
 
-The `keyPrefix` for Redis is used to namespace all the keys that the application generates or 
-references.  So for example a key `sites:999` would be `ru102js:sites:999` when written to Redis.
+The `keyPrefix` for Redis is used to namespace all the keys that the application generates or
+references. So for example a key `sites:999` would be `ru102js:sites:999` when written to Redis.
 
 # Load Sample Data
 
@@ -66,12 +68,12 @@ npm run load src/resources/data/sites.json flushdb
 
 `flushdb` is optional, and will erase ALL data from Redis before inserting the sample data.
 
-The application uses the key prefix `ru102js` by default, so you should be able to use the 
+The application uses the key prefix `ru102js` by default, so you should be able to use the
 same Redis instance for this application and other data if necessary.
 
 # Development Workflow
 
-In order to speed up development, you can run the application using `nodemon`, so that any 
+In order to speed up development, you can run the application using `nodemon`, so that any
 changes to source code files cause the server to reload and start using your changes.
 
 ```
@@ -90,15 +92,15 @@ But you will then need to stop the server and restart it when you change code.
 
 # Accessing the Front End Web Application
 
-You should be able to see the front end solar dashboard app at: 
+You should be able to see the front end solar dashboard app at:
 
 ```
 http://localhost:8081/
 ```
 
 # Running Tests
 
-The project is setup to use [Jest](https://jestjs.io/en/) for testing.  To run all tests:
+The project is setup to use [Jest](https://jestjs.io/en/) for testing. To run all tests:
 
 ```
 npm test
@@ -110,7 +112,7 @@ To run a specific suite of tests (e.g. those in `tests/basic.test.js`):
 npm test -t basic
 ```
 
-To run Jest continuously in watch mode, which gives you access to menus allowing you to run 
+To run Jest continuously in watch mode, which gives you access to menus allowing you to run
 subsets of tests and many more options:
 
 ```
@@ -119,12 +121,12 @@ npm testdev
 
 # Linting
 
-This project uses [ESLint](https://eslint.org/) with a slightly modified version of the 
+This project uses [ESLint](https://eslint.org/) with a slightly modified version of the
 [Airbnb JavaScript Style Guide](https://github.com/airbnb/javascript).
 
-* The file `.eslintrc` contains a short list of rules that have been disabled for this project.
-* The file `.eslintignore` contains details of paths that the linter will not consider when 
-linting the project.
+- The file `.eslintrc` contains a short list of rules that have been disabled for this project.
+- The file `.eslintignore` contains details of paths that the linter will not consider when
+ linting the project.
 
 To run the linter: