Add README

Signed-off-by: Alex Ellis (OpenFaaS Ltd) <alexellis2@gmail.com>

Author: alexellis

README.md

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+kubetrim
+====================================================
+
+Tidy up any old or broken Kubernetes clusters and contexts from your kubeconfig.
+
+kubetrim tries to connect to each cluster in the current kubeconfig file, and removes any that are unreachable, or which error.
+
+## Usage
+
+```bash
+$ kubectx
+
+default
+do-lon1-openfaas-cluster
+kind-2
+kind-ingress
+
+$ kubetrim
+
+kubetrim (dev) by Alex Ellis 
+
+Loaded: /home/alex/.kube/config. Checking..
+  - kind-2: ✅
+  - kind-ingress: ❌ - (failed to connect to cluster: Get "https://127.0.0.1:40349/api/v1/nodes": dial tcp 127.0.0.1:40349: connect: connection refused)
+  - default: ✅
+  - do-lon1-openfaas-cluster: ❌ - (failed to connect to cluster: Get "https://da39a3ee5e6b4b0d3255bfef95601890afd80709.k8s.ondigitalocean.co.uk/api/v1/nodes": dial tcp: lookup da39a3ee5e6b4b0d3255bfef95601890afd80709.k8s.ondigitalocean.co.uk on 127.0.0.53:53: no such host)
+Updated: /home/alex/.kube/config (in 364ms).
+
+$ kubectx
+
+default
+kind-2
+```
+
+Try out kubetrim without writing changes to the kubeconfig file:
+
+```bash
+$ kubetrim --dry-run
+```
+
+Use a different kubeconfig file:
+
+```bash
+$ KUBECONFIG=$HOME/.kube/config.bak kubetrim
+```
+
+## Installation
+
+Getting `kubetrim` with arkade:
+
+```bash
+curl -sfLS https://get.arkade.dev | sh
+
+arkade get kubetrim
+```
+
+## License
+
+MIT license

hack/hashgen.sh

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+#!/bin/sh
+
+for f in bin/kubetrim*; do shasum -a 256 $f > $f.sha256; done