[httpie/en] Add guide for using HTTPie (#4853)

- Add a comprehensive guide on using HTTPie as a powerful command-line HTTP
  client. The guide covers basic usage, URL shortcuts, optional GET and POST
  methods, querystring parameters, sending data in JSON, form data, and files,
  managing headers and authentication, as well as response handling options.
- The guide aims to provide developers, testers, and system administrators with
  a simple and intuitive reference for interacting with HTTP servers using
  HTTPie.

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+---
+category: tool
+tool: httpie
+contributors:
+  - ["Adaías Magdiel", "https://github.com/AdaiasMagdiel"]
+filename: learn-httpie.sh
+---
+
+HTTPie is a powerful command-line HTTP client designed for easy interaction
+with HTTP servers. It provides a simple and intuitive interface, making it an
+excellent tool for developers, testers, and system administrators.
+
+## Basic Usage
+
+HTTPie follows a simple syntax: http [flags] [METHOD] URL [items].
+
+```bash
+http GET https://api.example.com/posts
+```
+
+You can print the request without sending it by using the `--offline` flag.
+
+```bash
+http --offline https://api.example.com/posts
+```
+
+### URL shortcuts for `localhost`
+
+HTTPie supports a curl-like shorthand for localhost. For instance, ":3000"
+expands to "http://localhost:3000". If the port is omitted, it assumes port 80.
+
+```bash
+http :/users    # http://localhost/users
+http :5000/rss  # http://localhost:5000/rss
+```
+
+### Optional GET and POST
+
+If you don't specify the METHOD, the HTTPie will use:
+
+- GET for requests without body
+- POST for requests with body
+
+```bash
+http https://api.example.com/tags # GET tags
+http https://api.example.com/tags title="Tutorial" slug="tutorial" # POST a new tag
+```
+
+## Querystring Parameters
+
+
+If you're manually adding query string parameters in the terminal, try the
+`param==value` syntax. It avoids shell escaping for & separators and
+automatically URL-escapes special characters in parameter names and values.
+This differs from parameters in the full URL, which HTTPie doesn't modify.
+
+```bash
+http https://api.example.com/search q==httpie per_page==20
+```
+
+## Sending Data
+
+You can send data in various formats such as JSON, form data, or files.
+
+### JSON Data
+
+```bash
+http POST https://api.example.com/posts title="Hello" body="World"
+```
+
+### Form Data
+
+```bash
+http -f POST https://api.example.com/submit name=John email=john@example.com
+```
+
+### Files
+
+```bash
+http --form POST https://api.example.com/upload file@/path/to/file.txt
+```
+
+## Headers and Authentication
+
+HTTPie allows you to set headers and handle authentication easily.
+
+### Headers
+
+```bash
+http GET https://api.example.com/posts Authorization:"Bearer Token" User-Agent:"HTTPie"
+```
+
+### Basic Authentication
+
+```bash
+http -a username:password GET https://api.example.com/protected
+```
+
+### Bearer Authentication
+
+```bash
+https -A bearer -a token https://api.example.com/admin
+```
+
+## Response Handling
+
+HTTPie provides various options for handling responses.
+
+```bash
+http GET https://api.example.com/data Accept:application/json  # Pretty Print JSON
+
+http GET https://api.example.com/image --output image.png      # Save Response to File
+
+http --follow GET https://example.com  # Follow Redirects
+```
+
+## Further Reading
+
+- [Official Documentation](https://httpie.io/docs/cli).
+- [Github](https://github.com/httpie).