Composer/Packagist could not find package for minimum stability

There is no stable version of this package. Use

composer require cr/hashcli:dev-master

Since you mentioned that you are the author of the package you should create a release if you think that your version may be used in production.

You can do this at GitHub:

1. Click on 0 releases

2. Create a new release

3. Create a release version, perhaps v1.0, add a description and push the button:

4. Try to reinstall with composer. Make sure to remove the cahce first composer clear-cache and then just try composer require your/pagackge.

Sidenote:

I recommend you to read this to understand when you should name a release v1.0.1 or v1.1 or v.2.0-alpha etc. Here is a little excerpt:

3. Once a versioned package has been released, the contents of that version MUST NOT be modified. Any modifications MUST be released as anew version.

In other words, if you push something to your repository and you do not create another release. People are only able to download the latest release through composer.

6.Patch version Z (x.y.Z | x > 0) MUST be incremented if only backwards compatible bug fixes are introduced. A bug fix is defined asan internal change that fixes incorrect behavior.

For bug fixes that are not breaking anything you may update to v1.0.1

7.Minor version Y (x.Y.z | x > 0) MUST be incremented if new, backwards compatible functionality is introduced to the public API. ItMUST be incremented if any public API functionality is marked asdeprecated. [...]

If you add new functionality that does not break the code you should call the next release v1.1.0.

8.Major version X (X.y.z | X > 0) MUST be incremented if any backwards incompatible changes are introduced to the public API.

If you do something that may breaks the code from other people, you may call the new release v2.0

9.A pre-release version MAY be denoted by appending a hyphen and a series of dot separated identifiers immediately following the patchversion. Identifiers MUST comprise only ASCII alphanumerics and hyphen[0-9A-Za-z-].

Anything called v1.3-alpha or v1.3-christmas will be seen as a pre-release.

If you want to be able to install dev packages you can change your composer config for that project:

composer config minimum-stability devcomposer config prefer-stable true