chore: add README

README.md

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+# Formidable
+
+Web-based - but terminal compatible ! - little form editor using [JSONSchema](https://json-schema.org/) models.
+
+**Terminal compatible ?**
+
+The generated web UI does not use Javascript and can be used with terminal browsers like [w3m](https://en.wikipedia.org/wiki/W3m) or [lynx](https://en.wikipedia.org/wiki/Lynx_(web_browser)).
+
+## Install
+
+### Manually
+
+Download the pre-compiled binaries from the [releases page](https://github.com/Bornholm/formidable/releases) and copy them to the desired location.
+
+### Bash script
+
+```
+curl -sfL https://raw.githubusercontent.com/Bornholm/formidable/master/misc/script/install.sh | bash
+```
+
+It will download `frmd` to your current directory.
+
+#### Script available environment variables
+
+|Name|Description|Default|
+|----|-----------|-------|
+|`FORMIDABLE_VERSION`|Formidable version to download|`latest`|
+|`FORMIDABLE_DESTDIR`|Formidable destination directory|`.`|
+
+## Usage
+
+### Defining a schema
+
+### Using default values
+
+### Handling values update
+
+## Licence
+
+AGPL-3.0