Add GLOSSARY.md

Author: iliana

GLOSSARY.md

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+## Bottlerocket terms
+
+* [**block-party**](sources/updater/block-party): A library that helps retrieve information about Linux block devices.
+* [**bork**](sources/api/bork): A setting generator called by sundog to generate the random seed for updog, determining where the host falls in the update order.
+* [**buildsys**](tools/buildsys): A build tool that runs package and image builds inside containers.
+  cargo-make starts the build of each package, each of which calls buildsys, which in turn starts a Docker-based build using the SDK image.
+* [**early-boot-config**](sources/api/early-boot-config): A program run at boot to read platform-specific data, such as EC2 user data, and send requested configuration to the API.
+* **gptprio:** A structure of bits in GPT partition headers that specifies priority, tries remaining, and whether the partition booted successfully before.
+  signpost sets these and GRUB uses them to determine which partition set to boot.
+* [**growpart**](sources/growpart): A program used to expand disk partitions upon boot.
+* **host containers**: Containers that run in a separate instance of containerd than "user" containers spawned by an orchestrator (e.g. Kubernetes).
+  Used for system maintenance and connectivity.
+* [**host-ctr**](sources/host-ctr): The program started by `host-containers@.service` for each host container.
+  Its job is to start the specified host container on the “host” instance of containerd, which is separate from the “user” instance of containerd used for Kubernetes pods.
+* [**laika**](sources/preinit/laika): A crate that builds a binary (`/sbin/preinit`) that's used to mount filesystems before starting init (`systemd`).
+* [**model**](sources/models): The API system has a data model defined for each variant, and this model is used by other programs to serialize and deserialize requests while maintaining safety around data types.
+* [**netdog**](sources/api/netdog): A program called by wicked to retrieve and write out network configuration from DHCP.
+* [**pluto**](sources/api/pluto): A setting generator called by sundog to find networking settings required by Kubernetes.
+* [**schnauzer**](sources/api/schnauzer): A setting generator called by sundog to build setting values that contain template variables referencing other settings.
+* **setting generator**: A binary that generates the default value of a setting.
+* [**signpost**](sources/updater/signpost): A program used to manipulate the GPT header of the OS disk; fields in the header are used by GRUB to determine the partition set we should boot from.
+* [**storewolf**](sources/api/storewolf): A program that sets up the data store for the API upon boot.
+* [**sundog**](sources/api/sundog): A program run during boot that generates any settings that depend on runtime system information.
+  It finds settings that need generation by way of metadata in the API, and calls helper programs specified by that metadata.
+* [**thar-be-settings**](sources/api/thar-be-settings): A program that writes out system configuration files, replacing template variables with settings from the API.
+* [**updog**](sources/updater/updog): An update client that interfaces with a specified TUF updates repository to upgrade or downgrade Bottlerocket hosts to different image versions.
+
+## Non-Bottlerocket terms
+
+* **k8s**: [Kubernetes](https://kubernetes.io/), a container orchestration system.
+* [**CNI**](https://github.com/containernetworking/cni): Container Network Interface, a standard for writing plugins to configure network interfaces in containers.
+* **IMDS**: [Amazon EC2's Instance Metadata Service](https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-instance-metadata.html).
+  Used to retrieve user and platform configuration on an EC2 instance.
+* [**sonobuoy**](https://github.com/vmware-tanzu/sonobuoy): A diagnostic tool and runs Kubernetes conformance tests for Kubernetes clusters.
+* **SSM**: [AWS Systems Manager](https://aws.amazon.com/systems-manager/).
+  The [SSM agent](https://docs.aws.amazon.com/systems-manager/latest/userguide/prereqs-ssm-agent.html) can be used for secure remote management.
+* [**tough**](https://crates.io/crates/tough): a Rust implementation of The Update Framework (TUF).
+* [**tuftool**](https://crates.io/crates/tuftool): a command line program for interacting with a TUF repo.
+* **TUF**: [The Update Framework](https://theupdateframework.io/).
+  A framework that helps developers maintain the security of software update systems.
+* [**wicked**](https://github.com/openSUSE/wicked): A network interface framework and management system.