Adding Contribution guide (#123)

* Add statement for non working examples to template
* Adding contribution guide
* Add statement about wayback machine

CONTRIBUTING.md

@@ -0,0 +1,49 @@
+# Contributing
+
+## Discssion board
+
+If you have a question or an idea regarding certain content but you want to have feedback of fellow community members 
+and you think it may not be appropriate to file an issue open a discussion in our [discussion board](https://github.com/rust-unofficial/patterns/discussions).
+
+
+## Writing a new article
+
+Before writing a new article please check our [issues](https://github.com/rust-unofficial/patterns/issues) and 
+the [Pull Requests](https://github.com/rust-unofficial/patterns/pulls) if there are existing issues or someone
+is working on that topic.
+
+If you don't find an issue regarding your topic and you are sure it is not more feasible to open a thread in the [discussion board](https://github.com/rust-unofficial/patterns/discussions)
+please open a new issue, so we can discuss about the ideas and future content of the article together and maybe
+give some feedback/input on it. 
+
+When writing a new article it's recommended to copy the [pattern template](https://github.com/rust-unofficial/patterns/blob/master/template.md) into the
+appropriate directory and start editing it. You may not want to fill out every section and remove it or you might want to add extra sections.
+
+Consider writing your article in a way that has a low barrier of entry so also [Rustlings](https://github.com/rust-lang/rustlings) can follow
+and understand the thought process behind it. So we can encourage people to use these patterns early on. 
+
+We encourage you to write idiomatic Rust code that builds in the [playground](https://play.rust-lang.org/).
+
+If you use links to blogposts or in general content that is not to be sure existing in a few years (e.g. pdfs) please take a snapshot
+with the [Wayback Machine](https://web.archive.org/) and use the link to that snapshot in your article.
+
+Don't forget to add your new article to the `SUMMARY.md` to let it be rendered to the book.
+
+Please make `Draft Pull requests` early so we can follow your progress and can give early feedback (see the following section). 
+
+
+
+## Creating a Pull Request
+
+"Release early and often!" also applies to pull requests!
+
+Once your article has some visible work, create a `[WIP]` draft pull request and give it a description of what you did or want to do.
+Early reviews of the community are not meant as an offense but to give feedback. 
+
+A good principle: "Work together, share ideas, teach others."
+
+### Important Note
+
+Please **don't force push** your branch to keep commit history and make it easier of us to see changes between reviews.
+
+Make sure to `Allow edits of maintainers` (under the text box) in the PR so people can actually collaborate on things or fix smaller issues themselves.

README.md

@@ -8,6 +8,7 @@ language that you can read [here](https://rust-unofficial.github.io/patterns/).
 
 [Introduction](intro.md)
 
+
 ### Idioms
 
 * [Constructor](idioms/ctor.md)
@@ -68,16 +69,11 @@ language that you can read [here](https://rust-unofficial.github.io/patterns/).
 
 ## Contributing
 
-Contributions are very welcome!
-
-You should start with [the template](template.md). Copy it into the appropriate
-directory, edit it, and submit a PR. You might not want every section, and you
-might want to add extra sections.
+You are missing content in this repository that can be helpful for others and you are eager to explain it?
+Awesome! We are always happy about new contributions (e.g. elaboration or corrections on certain topics) to this project.
 
-We suggest leaving a comment on the [issue tracker](https://github.com/rust-unofficial/patterns/issues)
-so that other people don't start working on the same topic.
+We suggest reading our [Contribution guide](./CONTRIBUTION.md) to get more information on how it works.
 
-Correction and elaboration PRs are very welcome.
 
 ## Building with mdbook
 
@@ -93,3 +89,8 @@ If you want to build it locally you can run one of these two commands in the roo
 
   Serves the book at `http://localhost:3000` (port is changeable, take a look at the terminal output 
   to be sure) and reloads the browser when a change occurs.
+
+
+## License
+
+This content of this repository is licensed under **MPL-2.0**; see [LICENSE](./LICENSE).

template.md

@@ -12,6 +12,15 @@ A short, prose description of the pattern.
 // liberally.
 ```
 
+When writing examples, please try to make them compile. This allows us to test
+them. If you fail to write an example that is both complete and readable,
+please at least mark your example code with `ignore` as in here:
+
+```rust,ignore
+// A non-runnable example of the pattern in action, should be mostly code, commented
+// liberally.
+```
+
 
 ## Motivation