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/adapters/adapters.js

@@ -0,0 +1,79 @@
+import utils from '../utils.js';
+import httpAdapter from './http.js';
+import xhrAdapter from './xhr.js';
+import fetchAdapter from './fetch.js';
+import AxiosError from "../core/AxiosError.js";
+
+const knownAdapters = {
+  http: httpAdapter,
+  xhr: xhrAdapter,
+  fetch: fetchAdapter
+}
+
+utils.forEach(knownAdapters, (fn, value) => {
+  if (fn) {
+    try {
+      Object.defineProperty(fn, 'name', {value});
+    } catch (e) {
+      // eslint-disable-next-line no-empty
+    }
+    Object.defineProperty(fn, 'adapterName', {value});
+  }
+});
+
+const renderReason = (reason) => `- ${reason}`;
+
+const isResolvedHandle = (adapter) => utils.isFunction(adapter) || adapter === null || adapter === false;
+
+export default {
+  getAdapter: (adapters) => {
+    adapters = utils.isArray(adapters) ? adapters : [adapters];
+
+    const {length} = adapters;
+    let nameOrAdapter;
+    let adapter;
+
+    const rejectedReasons = {};
+
+    for (let i = 0; i < length; i++) {
+      nameOrAdapter = adapters[i];
+      let id;
+
+      adapter = nameOrAdapter;
+
+      if (!isResolvedHandle(nameOrAdapter)) {
+        adapter = knownAdapters[(id = String(nameOrAdapter)).toLowerCase()];
+
+        if (adapter === undefined) {
+          throw new AxiosError(`Unknown adapter '${id}'`);
+        }
+      }
+
+      if (adapter) {
+        break;
+      }
+
+      rejectedReasons[id || '#' + i] = adapter;
+    }
+
+    if (!adapter) {
+
+      const reasons = Object.entries(rejectedReasons)
+        .map(([id, state]) => `adapter ${id} ` +
+          (state === false ? 'is not supported by the environment' : 'is not available in the build')
+        );
+
+      let s = length ?
+        (reasons.length > 1 ? 'since :\n' + reasons.map(renderReason).join('\n') : ' ' + renderReason(reasons[0])) :
+        'as no adapter specified';
+
+      throw new AxiosError(
+        `There is no suitable adapter to dispatch the request ` + s,
+        'ERR_NOT_SUPPORT'
+      );
+    }
+
+    return adapter;
+  },
+  adapters: knownAdapters
+}