Update project_technologies.json

Initial version of project_technologies.json:

apis: "maps"

platforms: "raspberry pi", "linux"

toolkits: "opengl"

themes: "ecology", "environment", "survival", "climate change", "water", "conservation", 
"pollution", "world citizens", "disasters", "overpopulation", "overdevelopment", "deforestation",
"ocean acidification", "erosion"