chore: add ADR about when to use plural for mod names

docs/adrs/20240227164834_use_plural_for_modules_containing_collections.md

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+# Use plural for modules containing collections of types
+
+## Description
+
+In Rust, the naming conventions for module names (mod names) generally lean
+towards using the singular form, rather than plurals. This practice aligns with
+Rust's emphasis on clarity and precision in code organization. The idea is that
+a module name should represent a single concept or functionality, which often
+means using a singular noun to describe what the module contains or does.
+
+However, it's important to note that conventions can vary depending on the
+context or the specific project. Some projects may choose to use plural forms
+for module names if they feel it more accurately represents the contents of the
+module. For example, a module that contains multiple implementations of a
+similar concept or utility functions related to a specific theme might be named
+in the plural to reflect the diversity of its contents.
+
+This could have some pros anc cons. For example, for a module containing types of
+requests you could refer to a concrete request with `request::Announce` or
+`requests::Announce`. If you read a code line `request::Announce` is probably
+better. However, if you read the filed or folder name `requests`gives you a
+better idea of what the modules contains.
+
+## Agreement
+
+We agree on use plural in cases where the modules contain some types with the
+same type of responsibility. For example:
+
+- `src/servers`.
+- `src/servers/http/v1/requests`.
+- `src/servers/http/v1/responses`.
+- `src/servers/http/v1/services`.
+- Etcetera.
+
+We will change them progressively.

docs/adrs/README.md

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+# Architectural Decision Records (ADRs)
+
+This directory contains the architectural decision records (ADRs) for the
+project. ADRs are a way to document the architectural decisions made in the
+project.
+
+More info: <https://adr.github.io/>.
+
+## How to add a new record
+
+For the prefix:
+
+```s
+date -u +"%Y%m%d%H%M%S"
+```
+
+Then you can create a new markdown file with the following format:
+
+```s
+20230510152112_title.md
+```
+
+For the time being, we are not following any specific template.