Add some documentation on the differences between SC an MC, close #257

Docs/MapComplete_vs_other_editors.md

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+# MapComplete versus other editors
+
+**StreetCo**mplete + **MapCo**ntrib = MapComplete
+
+## StreetComplete
+
+StreetComplete might look pretty similar to MapComplete at first glance - especially as it was a huge inspiration. However, there are a few huge differences between the two, especially in vision.
+
+### Vision
+
+The core philosophy of StreetComplete is **OpenStreetMap is cool! Help to improve it by answering these questions**
+The core philosophy of MapComplete is **Here is a map of topic XYZ - enjoy it and update it if there is still some info missing**
+
+This means that StreetComplete is mainly aimed towards people who are already OpenStreetMap-enthusiasts, whereas mapcomplete is aimed to an audience interested in a certain topic.
+Of course, the next step is to attempt to inform that audience why having an open map is so cool and that they can contribute as well.
+
+### Use cases
+
+StreetComplete is to help mappers quickly gather some data on fixed topics
+
+MapComplete is made to
+
+- show the OSM-data in great detail for a specific theme about XYZ
+- help mappers quickly add data for this theme if they are passing by
+- be embedded in other websites
+- Allow the addition of new themes
+
+### Technology
+
+StreetComplete is an android app, so can only be used on Android Phones
+
+MapComplete is a web-app, and thus works on all devices. It can be installed as PWA to give an 'app-like'-experience, but can just as well be embedded in other websites.
+
+### Feature comparison
+
+MapComplete is also an OpenStreetMap-viewer, while StreetComplete hides known values.
+
+MapComplete will not work offline.
+
+In MapComplete it is easier to add more experimental, extremely detailed and more personal styles, as each topic is separated with its own part.
+
+MapComplete is a bit more complex to use - both because one needs to go hunting for a specific map style rather than getting bunch of quests by default and is likely to ask far more detailed question (email address and phone number of bicycle shop etc). 
+After all if it would duplicate StreetComplete it would be a bit pointless and it is pretty hard to compete with SC by being easier to use and more newbie friendly, while there is space for "more complicated/detailed/involved editor working like SC".
+
+Also, MapComplete has no requirement to make question easy to answer, making both possible to ask more questions than StreetComplete but making it more complicated to use.
+
+No support for splitting ways in MapComplete (as of now - hopefully it'll get added one day).
+
+MapComplete allows the addition of new points, whereas StreetComplete does not.
+
+
+
+## MapContrib
+
+MapContrib is another very similar editor which served as inspiration. MapContrib offers - just like MapComplete - an extensible, thematic map view. However, I never understood the MapContrib user interface.
+
+MapContrib also allows to add new points and to edit tags - but it is very cumbersome.
+
+Note that the use case of MapContrib is much closer to MapComplete