Add changelog

CHANGELOG.md

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+# 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).
+
+## [Unreleased]
+
+## [4.1.0] - 2021-07-29
+### Added
+- Support for ARM nodes
+- firewalld service file for warewulfd
+- `-y` option to skip "Are you sure" queries
+- `wwctl kernel delete` command
+- `wwctl vnfs` alias for `wwctl container`
+- Support for authenticated OCI registries
+- warewulfd can reload config on SIGHUP and when the config file changes
+- Node database index to improve lookup speeds
+- Kernels and containers can be imported from a chroot subdirectory
+- Systemd service file
+
+### Changed
+- `wwctl node list` output beautification
+- Log timestamps are more precise
+- PID file and log files are now in `/var/run` and `/var/log`, respectively
+- `make install` no longer overwrites preexisting configuration files
+- Kernel modules and overlays are now compressed
+- `rootfstype` now uses `rootfs` in default kernel arguments
+- iPXE binaries updated
+- Installed container directory is deleted when import fails
+- Default iPXE script now reboots erroring nodes every 15 seconds
+- Only open `/etc/hosts` when writing
+
+### Removed
+- `wwctl configure` `--persist` flags have been removed. `configure` commands persist changes by default unless `--show` is used
+- In-repository documentation: has been moved to it's own repository
+
+### Fixed
+- Importing containers from directory
+- Debug log verbosity option takes precedence over verbose option
+- `wwctl node list -n` output is formatted corectly
+- Container names can contain an underscore
+- `wwctl overlay build --all` does not require an argument
+- specfile date format works with older versions of rpmbuild
+- Use SystemOverlay when building system overlay
+- dhcpd template now references correct wwctl subcommand
+- `wwctl node set kernelargs` and `wwctl profile set kernelargs` change kernel arguments