docs: add roadmap

README.md

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 A farming simulator for the gemini web.
 
+## Brainstorming
+
+* Every player starts out with a bag of seeds and one acre of land
+* Seeds take some amount of time to grow
+* At any point, a player can decide to harvest the crops
+* Harvesting will yield a multiplied amount of seeds and some crops
+* He can trade crops and seeds at the market
+* Market is regulated by players
+* Crops need water to grow
+* There are different kind of crops. Some grow fast and some slow. Some yield
+  more than others
+* Weather can influence the growth
+* Players can buy land
+* A field has properties: growth rate and size in acres
+* Seeds take up space on a field
+* Mystery seeds are seeds of an unknown kind
+
+## Roadmap
+
+### MVP
+
+* Registration/login on the platform using a client certificate
+* A new user receives a farm, a bag of wheat seeds and 1 acre of land
+* The main page shows a random message, your current balance, a link to the
+  market, your inventory and a list of your fields
+* The inventory shows your seeds. When clicking an item, you can select to sell
+  it, plant it or throw it away
+* A seed that has been planted grows for 24 hours. It goes through 4 phases:
+  seed, seedling, young crop, ready for harvesting
+* When a seed is harvested that is not ready, it will be discarded. When it's
+  ready, it will yield 2 wheat seeds and 4 wheat
+
+### The market
+
+The market offers the following products:
+
+1 bag of wheat seeds (0.1 acres): 2 gems buy, 1 gems sell
+
+1 wheat: 10 gems buy, 8 gems sell
+
+1 acre field: 100 gems buy, 80 gems sell
+
+2 acre field: 150 gems buy, 100 gems sell
+
+### Other kinds of seeds
+
+* Bamboo (grows fast, cheap, low yield)
+* Potatoes (grows averagely, reasonably priced, high yield)
+* Corn
+* Melons
+* Flowers
+* Mystery seeds can be obtained on the market
+
+### Plant Care
+
+* Plants need water (some more than others)
+* The market offers fertilizer that boost plant growth
+* Weather affects plant growth (sunshine, cloudy, rain)
+
+### Community
+
+* Players can place buy/sell orders on a market
+* Every item has its own overview, containing all orders
+* If the price of a buy order is above that of the highest sell order, the item
+  is traded
+* Buy/Sell orders can be fulfilled directly
+* A leaderboard shows the players with the most money or acres
+