Add contribution information

.github/FUNDING.yml

@@ -0,0 +1 @@
+github: undergroundwires

.gitignore

@@ -1 +1,7 @@
-node_modules
+# NPM
+node_modules
+
+# vscode
+
+.vscode/**/*
+!.vscode/extensions.json

.vscode/extensions.json

@@ -0,0 +1,6 @@
+{
+    "recommendations": [
+        "davidanson.vscode-markdownlint",
+        "timonwong.shellcheck"
+    ]
+}

CONTRIBUTING.md

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+# Contributing to bump-everywhere
+
+First off, thanks for taking the time to contribute! 💓
+
+You can contribute by:
+
+- creating pull requests,
+- creating or responding to [issues](https://github.com/undergroundwires/bump-everywhere/issues),
+- supporting the development and maintainance by [sponsoring me on GitHub](https://github.com/sponsors/undergroundwires) with a single time donation or reccuring donations, see more options in [undergroundwires.dev/donate](https://undergroundwires.dev/donate/),
+- giving the project a star,
+- or adding a badge in a project you use bump-everywhere, see [support](./README.md#support).
+
+## Development environment
+
+If you're using visual studio code, [recommended extensions](./.vscode/extensions.json) would install useful linters and extensions.
+
+## Style guide
+
+- Do not introduce any TODO comments, fix them or do not introduce the change.
+- Use common sense, simpler is better.
+
+### Shell scripting
+
+- Use [ShellCheck](https://www.shellcheck.net/) to lint your code.
+- Always check for return values.
+- Declare function-specific variables as `local`.
+- Declare variables as readonly whenever possible.
+  - E.g. `local -r ..`, `declare -r ..` or `readonly ..`.
+- Send all errors messages to stderr.
+  - E.g. `>&2 echo 'Error!'`.
+- Use always `#!/usr/bin/env bash` shebang.
+- Wrap long lines.
+- Use `[[ … ]]` over `[ … ]`, `test`.
+- Avoid eval at all cost.
+
+#### Naming conventions
+
+**Source file names:**
+
+- Use `kebab-case.sh`.
+- For tests, use `.test` suffix such as `<system-under-test>.test.sh`.
+
+**Function names:**
+
+- Use snake_case. E.g. `my_func() { ... }`
+- Prefix functions in files that others files source with a scope name and `::`. E.g. `utilities::has_value() { }`.
+
+**Variable names**:
+
+- Use snake_case for local variables.
+- Use ALL_CAPS_SEPARATED_WITH_UNDERSCORES for constant and environment variable names.

README.md

@@ -140,9 +140,11 @@ You can also use following scripts individually (check script files for usage, p
 
 ## Support
 
-- Give it a star ⭐
-- Feel free to use the badge in the `README.md` of repository where you use bump-everywhere:
-  - (it'll look like: [![Auto-versioned by bump-everywhere](https://github.com/undergroundwires/bump-everywhere/blob/master/badge.svg?raw=true)](https://github.com/undergroundwires/bump-everywhere))
+**Sponsor 💕**. Consider one time or recurring donation on [GitHub Sponsors](https://github.com/sponsors/undergroundwires) or [any other way (undrgroundwires.dev/donate)](https://undergroundwires.dev/donate), every penny you leave will help development and maintainance of the project .
+
+**Star 🤩**. If you do cannot do that you can just give it a star ⭐ . It helps me to see that the project is appreciated.
+
+**Badge 📛**. If you use the project, feel free to use the badge in the `README.md` of repository where you use bump-everywhere so we can have larger community that can help improving the project. It would look like [![Auto-versioned by bump-everywhere](https://github.com/undergroundwires/bump-everywhere/blob/master/badge.svg?raw=true)](https://github.com/undergroundwires/bump-everywhere)). You can add following in your markdown file:
 
 ```markdown
 [![Auto-versioned by bump-everywhere](https://github.com/undergroundwires/bump-everywhere/blob/master/badge.svg?raw=true)](https://github.com/undergroundwires/bump-everywhere)