Fixed linting problems + committed the lint config file. (#63)

* Fixed linting problems + committed the lint config file.

Generated the linting config file with the following configuration:
sam@rti-10678:~/working/trees/connector/rticonnextdds-connector-js$ eslint --init
✔ How would you like to use ESLint? · style
✔ What type of modules does your project use? · commonjs
✔ Which framework does your project use? · none
✔ Does your project use TypeScript? · No / Yes
✔ Where does your code run? · browser
✔ How would you like to define a style for your project? · guide
✔ Which style guide do you want to follow? · standard
✔ What format do you want your config file to be in? · JSON

* Fixed eslint file to state we use Node, not Browser

Co-authored-by: Sam Raeburn <sam@rti.com>
(cherry picked from commit 9cface5)

Author: samuelraeburn

.eslintrc.json

@@ -0,0 +1,15 @@
+{
+    "env": {
+        "node": true,
+        "commonjs": true,
+        "es2021": true
+    },
+    "extends": [
+        "standard"
+    ],
+    "parserOptions": {
+        "ecmaVersion": 12
+    },
+    "rules": {
+    }
+}