Updated README.md with some details on the UBI based base image

Signed-off-by: Mario Loriedo <mario.loriedo@gmail.com>

README.md

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-# development-images
-Specification of containers images for developers
+# Developer Images
+
+[![Build of UBI 8 based Developer Images](https://github.com/devfile/developer-images/actions/workflows/ubi8-build.yaml/badge.svg)](https://github.com/devfile/developer-images/actions/workflows/ubi8-build.yaml)
+
+Containers images with tools for developers 👨‍💻👩‍💻
+
+## Base Images
+
+- [Red Hat Universal Base Image (UBI)](https://developers.redhat.com/articles/ubi-faq#) based image: [quay.io/base-developer-image:ubi8](https://quay.io/repository/devfile/base-developer-image/)
+
+| Tool                | ubi8 package          |
+|---------------------|-----------------------|
+| `bash`              |`bash`                 |
+| `curl`              |`curl`                 |
+| `diff`              |`diffutils`            |
+| `emacs`             |**`emacs <fedora>`**   |
+| `fish`              |**`fish <fedora>`**    |
+| `git`               |`git`                  |
+| `ip`                |`iproute`              |
+| `jq`                |`jq`                   |
+| `htop`              |**`htop <fedora>`**    |
+| `less`              |`less`                 |
+| `lsof`              |`lsof`                 |
+| `man`               |`man`                  |
+| `nano`              |`nano`                 |
+| `netcat`            |`<not found>`          |
+| `netstat`           |`net-tools`            |
+| `openssh-client`    |`openssh-clients`      |
+| `ripgrep`           |**`ripgrep <fedora>`** |
+| `rsync`             |`rsync`                |
+| `scp`               |`openssh-clients`      |
+| `screen`            |`<not found>`          |
+| `sed`               |`sed`                  |
+| `socat`             |`socat`                |
+| `sudo`              |`sudo`                 |
+| `ss`                |`<not found>`          |
+| `ssl-cert`          |`<not found>`          |
+| `tail`              |`<built in>`           |
+| `tar`               |`tar`                  |
+| `time`              |`time`                 |
+| `tldr`              |`<not found>`          |
+| `tmux`              |**`tmux <fedora>`**    |
+| `vim`               |`vim`                  |
+| `wget`              |`wget`                 |
+| `zip`               |`zip`                  |
+| `zsh`               |**`zsh <fedora>`**     |
+| **TOTAL SIZE**      | **1.04GB** (364.4MB compressed) |
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