HTTP/HTTPS Binary Cache Store Access

1st chunk of `src/libstore/http-binary-cache-store.md`

f73f1c9c24eb26ab996ac1c0ce8d402304e5b6ff107ca6c10000000100000083

R"(

**Store URL format**: `http://...`, `https://...`

This store allows a binary cache to be accessed via the HTTP
protocol.

)"

Title: HTTP/HTTPS Binary Cache Store Access

Summary

This store facilitates access to a binary cache using the HTTP protocol. It supports both `http://` and `https://` formats for its URL.