[bin/README][m]: add pre-existing README (from old repo https://github.com/datopian/portal-cli-app/edit/main/README.md).

bin/README.md

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+Simple CLI for displaying and publishing datasets
+
+## Features
+
+### Show
+
+Easily preview data locally. 
+I have a dataset `my-data` with the following content:
+```
+README.md
+data.csv
+## descriptor is optional (we infer if not there) 
+# datapackage.json
+```
+I can do the following:
+```
+cd my-data
+portal show
+```
+I get a nice dataset page like:
+
+TODO
+
+The single show command gives me access to the following:
+
+* Elegant presentation
+* Shows the data in a table etc (searchable / filterable)
+* Supports other data formats e.g. json, xlsx etc
+* Show graphs
+* Data summary
+
+Show works with: 
+
+* README + csv
+* Frictionless dataset
+* Frictionless resource
+* Pure README with frontmatter
+ 
+### Deploy [Not implemented yet]
+
+Easily publish your dataset online. 
+
+If i have a dataset `my_data`:
+
+```
+cd my-data
+portal deploy
+```
+
+Gives me a url like: 
+ 
+`Myusername-my-dataset.datahub.io`
+
+Deploy: what does it do?
+
+* Deploys a shareable url with the content of show
+  * Semi-private
+  * Can integrate access control (?)
+* Deploys a data API
+* [Other integrations e.g. push to google spreadsheets]
+* Dashboard showing your DataHub/Portal projects
+
+## User Guide
+
+Install portal-cli-app globally on your computer
+
+```bash
+npm install -g git+https://github.com/datopian/portal-experiment.git 
+```
+
+> Note: It is recommended you install portal-cli-app globally so you can run the portal show command from anywhere in your computer. 
+
+In a folder with your dataset and optionally datapackage.json, run the command:
+
+```bash
+portal show 
+```
+
+You can also specify a folder from directory:
+
+```bash
+portal show path=\some\path\dataset 
+```
+
+Optional args you can pass yo the show command are:
+
+- path: The path to a dataset directory. If blank, defaults to current working directory
+- port: The port number to display your dataset in. Defaults to 3000.
+- npm: Whether or not to use npm when install packages. Defaults to `false`, uses yarn. 
+
+```
+portal show [path=/some/path/dataset | port=4000 | npm=true]
+```