chore(changelog): 🧹 add CHANGELOG.md + changelog cog template

Signed-off-by: Eric Villard <[email protected]>

CHANGELOG.md

@@ -0,0 +1,8 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+- - -

changelog.tera

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+{% if version.tag and from.tag -%}
+    ## [{{ version.tag }}]({{repository_url ~ "/compare/" ~ from.tag ~ ".." ~ version.tag}}) - {{ date | date(format="%Y-%m-%d") }}
+{% elif version.tag and from.id -%}
+    ## [{{ version.tag }}]({{repository_url ~ "/compare/" ~ from.id ~ ".." ~ version.tag}}) - {{ date | date(format="%Y-%m-%d") }}
+{% else -%}
+    {% set from = from.id -%}
+    {% set to = version.id -%}
+
+    {% set from_shorthand = from.id | truncate(length=7, end="") -%}
+    {% set to_shorthand = version.id | truncate(length=7, end="") -%}
+
+    ## Unreleased ([{{ from_shorthand ~ ".." ~ to_shorthand }}]({{repository_url ~ "/compare/" ~ from_shorthand ~ ".." ~ to_shorthand}}))
+{% endif -%}
+
+{% for type, typed_commits in commits | sort(attribute="type")| group_by(attribute="type")-%}
+
+### {{ type | upper_first }}
+{% for scope, scoped_commits in typed_commits | group_by(attribute="scope") -%}
+
+{% for commit in scoped_commits | sort(attribute="scope") -%}
+    {% if commit.author and repository_url -%}
+        {% set author = "@" ~ commit.author -%}
+        {% set author_link = platform ~ "/" ~ commit.author -%}
+        {% set author = "[" ~ author ~ "](" ~ author_link ~ ")" -%}
+    {% else -%}
+        {% set author = commit.signature -%}
+    {% endif -%}
+    {% set commit_link = repository_url ~ "/commit/" ~ commit.id -%}
+    {% set shorthand = commit.id | truncate(length=7, end="") -%}
+    - **({{ scope }})** {{ commit.summary }} - ([{{shorthand}}]({{ commit_link }})) - {{ author }}
+{% endfor -%}
+
+{% endfor -%}
+
+{% for commit in typed_commits | unscoped -%}
+    {% if commit.author and repository_url -%}
+        {% set author = "@" ~ commit.author -%}
+        {% set author_link = platform ~ "/" ~ commit.author -%}
+        {% set author = "[" ~ author ~ "](" ~ author_link ~ ")" -%}
+    {% else -%}
+        {% set author = commit.signature -%}
+    {% endif -%}
+    {% set commit_link = repository_url ~ "/commit/" ~ commit.id -%}
+    {% set shorthand = commit.id | truncate(length=7, end="") -%}
+    - {{ commit.summary }} - ([{{shorthand}}]({{ commit_link }})) - {{ author }}
+{% endfor -%}
+
+{% endfor -%}