add Disease class

lua/autorun/server/sv_disease.lua

@@ -0,0 +1,20 @@
+Disease = {}
+
+--- Disease class
+---@param side name string? the name of the disease (string)
+---@param side symbtoms_by_stages list? a list of list of symbtom, a list of symbtoms by stage (Symbtom)
+---@param side contaminations_methods list? a list of contamination method (string)
+---@param side transmissions_zone_by_stage list? a list of transmissions zone (int), one number by stage
+---@param side stages_durations list? a list of stage duration (int), one number by stage
+function Disease:new(name, symbtoms_by_stages, contaminations_methods, transmissions_zone_by_stages, stages_durations)
+    local instance = {}
+    setmetatable(instance, {__index = Disease})
+    instance.name = name
+    instance.symbtoms_by_stages = symbtoms_by_stages
+    instance.contaminations_methods = contaminations_methods
+    instance.transmissions_zone_by_stages = transmissions_zone_by_stages
+    instance.stages_durations = stages_durations
+    return instance
+end
+
+return Disease