Adds Readme

README.md

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+# kubecerts
+
+Shows TLS/SSL certificates info for hosts/ingresses.  
+
+## Install
+
+You will need [kubectl](https://kubernetes.io/docs/tasks/tools/install-kubectl/) installed and working in your context for ingress queries. (TLDR; `kubectl get ingress -A`)
+
+* generic Unix install
+```console
+git clone https://github.com/aaparmeggiani/kubecerts
+make install
+```
+
+* macOS / Homebrew
+```console
+brew tap aaparmeggiani/repo  (homebrew-repo)
+brew install kubecerts
+```
+
+## Usage
+```console
+kubecerts [hosts] | [options]
+ops:
+    -h, --help              this help
+    -n, --namespace [ns]    namespace to query - default: current
+    -A, --all-namespaces    query ingress in all namespaces
+    -f, --file [filename]   read hosts from file, one host per line
+    -o, --output [format]   [ table | list | verbose ] - default: table
+    -v, --version           Prints the kubetail version
+```
+
+## Examples
+```console
+$ date
+Fri  6 Dec 2019 15:59:11 GMT
+
+$ kubecerts github.com letsencrypt.org expired.badssl.com
+HOST                START                 EXPIRE                VERIFY
+github.com          2018-05-08T00:00:00Z  2020-06-03T12:00:00Z  ok.
+letsencrypt.org     2019-09-29T16:33:36Z  2019-12-28T16:33:36Z  ok.
+expired.badssl.com  2015-04-09T00:00:00Z  2015-04-12T23:59:59Z  result: certificate has expired (10), continuing anyway.
+
+$ kubecerts --all-namespaces
+HOST                    START                 EXPIRE                VERIFY
+api.mydomain.com        2019-10-03T07:56:55Z  2020-01-01T07:56:55Z  ok.
+auth.mydomain.com       2019-09-22T13:18:11Z  2019-12-21T13:18:11Z  ok.
+admin.mydomain.com      2019-09-22T13:18:11Z  2019-12-21T13:18:11Z  ok.
+console.mydomain.com    2019-10-03T09:07:42Z  2020-01-01T09:07:42Z  ok.
+developer.mydomain.com  2019-10-03T09:07:40Z  2020-01-01T09:07:40Z  ok.
+mydomain.com            2019-09-22T13:18:11Z  2019-12-21T13:18:11Z  ok.
+www.mydomain.com        2019-09-22T13:18:11Z  2019-12-21T13:18:11Z  ok.
+
+$ kubecerts google.com --output list
+>> google.com
+*  subject: C=US; ST=California; L=Mountain View; O=Google LLC; CN=*.google.com
+*  start date: Nov  5 07:46:16 2019 GMT
+*  expire date: Jan 28 07:46:16 2020 GMT
+*  issuer: C=US; O=Google Trust Services; CN=GTS CA 1O1
+*  SSL certificate verify ok.
+
+```
+
+## Todo
+* namespace column (when `--all-namespaces`)
+* column filters
+* `subject`, `issuer`,  `days to expire` columns
+* add 
+
+
+## License
+MIT
+
+alpine dependencies
+bash
+curl 
+util-linux
+*date doesn-t accept -f parameter