chore(kontemplate): Prepare kontemplate for depot-merge

This merge will not yet include moving over to buildGo.nix, as support
for testing and such is not present in that library yet.

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+Kontemplate - A simple Kubernetes templater
+===========================================
+
+[![Build Status](https://travis-ci.org/tazjin/kontemplate.svg?branch=master)](https://travis-ci.org/tazjin/kontemplate)
+
+[Kontemplate][] is a simple CLI tool that can take sets of Kubernetes resource
+files with placeholders and insert values per environment.
+
+This tool was made because in many cases all I want in terms of Kubernetes
+configuration is simple value interpolation per environment (i.e. Kubernetes
+cluster), but with the same deployment files.
+
+In my experience this is often enough and more complex solutions such as
+[Helm][] are not required.
+
+Check out a Kontemplate setup example and the feature list below!
+
+<!-- markdown-toc start - Don't edit this section. Run M-x markdown-toc-refresh-toc -->
+**Table of Contents**
+
+- [Kontemplate - A simple Kubernetes templater](#kontemplate---a-simple-kubernetes-templater)
+    - [Features](#features)
+    - [Example](#example)
+    - [Installation](#installation)
+        - [Homebrew](#homebrew)
+        - [Arch Linux](#arch-linux)
+        - [Building repeatably from source](#building-repeatably-from-source)
+        - [Building from source](#building-from-source)
+    - [Usage](#usage)
+    - [Contributing](#contributing)
+
+<!-- markdown-toc end -->
+
+## Features
+
+* [Simple, yet powerful templates](docs/templates.md)
+* [Clean cluster configuration files](docs/cluster-config.md)
+* [Resources organised as simple resource sets](docs/resource-sets.md)
+* Integration with pass
+* Integration with kubectl
+
+## Example
+
+Kontemplate lets you describe resources as you normally would in a simple folder structure:
+
+```
+.
+├── prod-cluster.yaml
+└── some-api
+    ├── deployment.yaml
+    └── service.yaml
+```
+
+This example has all resources belonging to `some-api` (no file naming conventions enforced at all!) in the `some-api`
+folder and the configuration for the cluster `prod-cluster` in the corresponding file.
+
+Lets take a short look at `prod-cluster.yaml`:
+
+```yaml
+---
+context: k8s.prod.mydomain.com
+global:
+  globalVar: lizards
+include:
+  - name: some-api
+    values:
+      version: 1.0-0e6884d
+      importantFeature: true
+      apiPort: 4567
+```
+
+Those values are then templated into the resource files of `some-api`. That's it!
+
+You can also set up more complicated folder structures for organisation, for example:
+
+```
+.
+├── api
+│   ├── image-api
+│   │   └── deployment.yaml
+│   └── music-api
+│       └── deployment.yaml
+│   │   └── default.json
+├── frontend
+│   ├── main-app
+│   │   ├── deployment.yaml
+│   │   └── service.yaml
+│   └── user-page
+│       ├── deployment.yaml
+│       └── service.yaml
+├── prod-cluster.yaml
+└── test-cluster.yaml
+```
+
+And selectively template or apply resources with a command such as
+`kontemplate apply test-cluster.yaml --include api --include frontend/user-page`
+to only update the `api` resource sets and the `frontend/user-page` resource set.
+
+## Installation
+
+It is recommended to install Kontemplate from the signed binary releases available on the
+[releases page][]. Release binaries are available for Linux, OS X, FreeBSD and Windows.
+
+### Homebrew
+
+OS X users with Homebrew installed can "tap" Kontemplate like such:
+
+```sh
+brew tap tazjin/kontemplate https://github.com/tazjin/kontemplate
+brew install kontemplate
+```
+
+### NixOS
+
+Kontemplate has been included in [NixOS](https://nixos.org/) since version 17.09.
+
+It is available as `kontemplate` from the default Nix package set.
+
+### Arch Linux
+
+An [AUR package][] is available for Arch Linux and other `pacman`-based distributions.
+
+### Building from source
+
+Assuming you have Go configured correctly, you can simply `go get github.com/tazjin/kontemplate/...`.
+
+## Usage
+
+You must have `kubectl` installed to use Kontemplate effectively.
+
+```
+usage: kontemplate [<flags>] <command> [<args> ...]
+
+simple Kubernetes resource templating
+
+Flags:
+  -h, --help                 Show context-sensitive help (also try --help-long and --help-man).
+  -i, --include=INCLUDE ...  Resource sets to include explicitly
+  -e, --exclude=EXCLUDE ...  Resource sets to exclude explicitly
+
+Commands:
+  help [<command>...]
+    Show help.
+
+  template <file>
+    Template resource sets and print them
+
+  apply [<flags>] <file>
+    Template resources and pass to 'kubectl apply'
+
+  replace <file>
+    Template resources and pass to 'kubectl replace'
+
+  delete <file>
+    Template resources and pass to 'kubectl delete'
+
+  create <file>
+    Template resources and pass to 'kubectl create'
+
+```
+
+Examples:
+
+```
+# Look at output for a specific resource set and check to see if it's correct ...
+kontemplate template example/prod-cluster.yaml -i some-api
+
+# ... maybe do a dry-run to see what kubectl would do:
+kontemplate apply example/prod-cluster.yaml --dry-run
+
+# And actually apply it if you like what you see:
+kontemplate apply example/prod-cluster.yaml
+```
+
+Check out the feature list and the individual feature documentation above. Then you should be good to go!
+
+## Contributing
+
+Feel free to contribute pull requests, file bugs and open issues with feature suggestions!
+
+Kontemplate is licensed under the GPLv3, a copy of the license and its terms can be found
+in the `LICENSE` file.
+
+Please follow the [code of conduct](CODE_OF_CONDUCT.md).
+
+[Kontemplate]: http://kontemplate.works
+[Helm]: https://helm.sh/
+[releases page]: https://github.com/tazjin/kontemplate/releases
+[AUR package]: https://aur.archlinux.org/packages/kontemplate-git/
+[Repeatr]: http://repeatr.io/