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/raw-body/index.d.ts

@@ -0,0 +1,87 @@
+import { Readable } from 'stream';
+
+declare namespace getRawBody {
+  export type Encoding = string | true;
+
+  export interface Options {
+    /**
+     * The expected length of the stream.
+     */
+    length?: number | string | null;
+    /**
+     * The byte limit of the body. This is the number of bytes or any string
+     * format supported by `bytes`, for example `1000`, `'500kb'` or `'3mb'`.
+     */
+    limit?: number | string | null;
+    /**
+     * The encoding to use to decode the body into a string. By default, a
+     * `Buffer` instance will be returned when no encoding is specified. Most
+     * likely, you want `utf-8`, so setting encoding to `true` will decode as
+     * `utf-8`. You can use any type of encoding supported by `iconv-lite`.
+     */
+    encoding?: Encoding | null;
+  }
+
+  export interface RawBodyError extends Error {
+    /**
+     * The limit in bytes.
+     */
+    limit?: number;
+    /**
+     * The expected length of the stream.
+     */
+    length?: number;
+    expected?: number;
+    /**
+     * The received bytes.
+     */
+    received?: number;
+    /**
+     * The encoding.
+     */
+    encoding?: string;
+    /**
+     * The corresponding status code for the error.
+     */
+    status: number;
+    statusCode: number;
+    /**
+     * The error type.
+     */
+    type: string;
+  }
+}
+
+/**
+ * Gets the entire buffer of a stream either as a `Buffer` or a string.
+ * Validates the stream's length against an expected length and maximum
+ * limit. Ideal for parsing request bodies.
+ */
+declare function getRawBody(
+  stream: Readable,
+  callback: (err: getRawBody.RawBodyError, body: Buffer) => void
+): void;
+
+declare function getRawBody(
+  stream: Readable,
+  options: (getRawBody.Options & { encoding: getRawBody.Encoding }) | getRawBody.Encoding,
+  callback: (err: getRawBody.RawBodyError, body: string) => void
+): void;
+
+declare function getRawBody(
+  stream: Readable,
+  options: getRawBody.Options,
+  callback: (err: getRawBody.RawBodyError, body: Buffer) => void
+): void;
+
+declare function getRawBody(
+  stream: Readable,
+  options: (getRawBody.Options & { encoding: getRawBody.Encoding }) | getRawBody.Encoding
+): Promise<string>;
+
+declare function getRawBody(
+  stream: Readable,
+  options?: getRawBody.Options
+): Promise<Buffer>;
+
+export = getRawBody;