chore: add project dependencies and configuration files

Initial setup of project dependencies including axios, express, dotenv, and other supporting packages. Added configuration files and documentation for project setup and usage.

node_modules/axios/lib/helpers/parseHeaders.js

@@ -0,0 +1,55 @@
+'use strict';
+
+import utils from './../utils.js';
+
+// RawAxiosHeaders whose duplicates are ignored by node
+// c.f. https://nodejs.org/api/http.html#http_message_headers
+const ignoreDuplicateOf = utils.toObjectSet([
+  'age', 'authorization', 'content-length', 'content-type', 'etag',
+  'expires', 'from', 'host', 'if-modified-since', 'if-unmodified-since',
+  'last-modified', 'location', 'max-forwards', 'proxy-authorization',
+  'referer', 'retry-after', 'user-agent'
+]);
+
+/**
+ * Parse headers into an object
+ *
+ * ```
+ * Date: Wed, 27 Aug 2014 08:58:49 GMT
+ * Content-Type: application/json
+ * Connection: keep-alive
+ * Transfer-Encoding: chunked
+ * ```
+ *
+ * @param {String} rawHeaders Headers needing to be parsed
+ *
+ * @returns {Object} Headers parsed into an object
+ */
+export default rawHeaders => {
+  const parsed = {};
+  let key;
+  let val;
+  let i;
+
+  rawHeaders && rawHeaders.split('\n').forEach(function parser(line) {
+    i = line.indexOf(':');
+    key = line.substring(0, i).trim().toLowerCase();
+    val = line.substring(i + 1).trim();
+
+    if (!key || (parsed[key] && ignoreDuplicateOf[key])) {
+      return;
+    }
+
+    if (key === 'set-cookie') {
+      if (parsed[key]) {
+        parsed[key].push(val);
+      } else {
+        parsed[key] = [val];
+      }
+    } else {
+      parsed[key] = parsed[key] ? parsed[key] + ', ' + val : val;
+    }
+  });
+
+  return parsed;
+};