GSOC 2022: Student guide

Dear student,

If you are planning to write a GSOC 2022 proposal for Gridap, here is a list of references to help you strengthen your proposal:

1. **Must-read** :warning: [NumFOCUS contributing students guide](https://github.com/numfocus/gsoc/blob/master/CONTRIBUTING-students.md#our-expectations-from-students):
Since Gridap participates as a sub-organisation of NumFOCUS, *your proposals should follow these instructions*.
2. Some **examples** of NumFOCUS proposals awarded in 2017 are available [here](https://github.com/numfocus/gsoc/tree/master/2017).
3. The GSOC instructions from [The Julia Language](https://julialang.org/jsoc/guidelines/) *do not* apply to us, but can give you some **inspiration**.
4. **Advice** from the [Stochastic lifestyle blog](https://www.stochasticlifestyle.com/tips-google-summer-code-application/).

Please, do not hesitate to **comment on this issue**, if you have **any questions regarding the general application process** under NumFOCUS. We also encourage you to **open a dedicated issue** to discuss and **guide specifically your application** with your mentors and the broader Gridap community. You can title the issue as `GSOC 2022: [Preliminary proposal name]`.

Finally, you might find other interesting advice and examples, by searching through several GSOC organizations. Please, do share them with us! :smiley: