Docs: add changes to CHANGELOG

CHANGELOG.md

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+# Changelog
+
+## [1.0.0] - 2023-05-12
+
+### Added
+- Add sample document `apa-sample.pdf` for default `apa` template.
+- Add `paperer` script with the following options:
+  - `--source` or `-s` to specify the source directory where the templates are
+    located
+  - `--template` or `-t` to specify which template to use
+  - `--directory` or `-d` to specify the directory where to scaffold to scaffold
+    a new `LaTeX` manuscript
+  - `--update` to update `paperer` from GitHub
+  - `--uninstall` to uninstall `paperer`
+  - `--help` to display the help message
+- Add `install.sh` script to install `paperer`.
+- Generate a reasonable logo via `DALL-E`.
+- Add documentation to `README.md`.
+- Add `LaTeX` project template based on the `apa7` class.