Added checks to make sure the specified track exists

Added precondition checks to validate input files and paths to return more informative error messages as per #2

node_modules/qs/.eslintrc

@@ -0,0 +1,19 @@
+{
+    "root": true,
+
+    "extends": "@ljharb",
+
+    "rules": {
+        "complexity": 0,
+        "consistent-return": 1,
+		"func-name-matching": 0,
+        "id-length": [2, { "min": 1, "max": 25, "properties": "never" }],
+        "indent": [2, 4],
+        "max-params": [2, 12],
+        "max-statements": [2, 45],
+        "no-continue": 1,
+        "no-magic-numbers": 0,
+        "no-restricted-syntax": [2, "BreakStatement", "DebuggerStatement", "ForInStatement", "LabeledStatement", "WithStatement"],
+        "operator-linebreak": [2, "before"],
+    }
+}