[Qgis-psc] Proposal document about crediting financial contributors

[Andreas Neumann]

Hi PSC,

I started a proposal about crediting financial contributors: 
https://docs.google.com/a/qgis.org/document/d/1dw1-I8J42rtVZD6nPRYXf98kXcRXMOJx0SEUiWYES6w/edit#heading=h.yq8svk9728nz

Please feel free to correct/contribute.

Andreas