put mining drones/depots behind a tech and unlock iron sticks too

data.lua

@@ -3,6 +3,7 @@ names = require("shared")
 shared = require("shared")
 
 require "data/entities/entities"
+require "data/technologies/mining_drone"
 require "data/technologies/mining_speed"
 require "data/technologies/mining_productivity"
 

data/entities/mining_depot/mining_depot.lua

@@ -380,7 +380,7 @@ local recipe =
   type = "recipe",
   name = name,
   localised_name = {name},
-  enabled = true,
+  enabled = false,
   ingredients =
   {
     {type = "item", name = "iron-plate", amount = 50},

data/entities/mining_drone/mining_drone.lua

@@ -21,7 +21,7 @@ local recipe = {
   name = name,
   localised_name = {name},
   --category = ,
-  enabled = true,
+  enabled = false,
   ingredients =
   {
     {type = "item", name = "iron-plate", amount = 10},

data/technologies/mining_drone.lua

@@ -0,0 +1,41 @@
+local name = shared.mining_drone_technology
+
+local technology =
+{
+  name = name,
+  localised_name = {name},
+  type = "technology",
+  icons =
+  {
+     {
+       icon = "__Mining_Drones__/data/technologies/mining_drones_tech.png",
+       icon_size = 256,
+       icon_mipmaps = 0,
+     }
+  },
+  upgrade = false,
+  effects =
+  {
+    {
+      type = "unlock-recipe",
+      recipe = "mining-depot",
+    },
+    {
+      type = "unlock-recipe",
+      recipe = "mining-drone",
+    },
+    {
+      type = "unlock-recipe",
+      recipe = "iron-stick",
+    },
+  },
+  research_trigger =
+  {
+    type = "craft-item",
+    item = "iron-plate",
+    count = 50
+  },
+  order = name
+}
+
+data:extend{technology}

locale/en/mining_drones.cfg

@@ -1,6 +1,7 @@
 mining-depot-choose-resource=Choose resource for mining.
 mining-drone=Mining drone
 mining-depot=Mining depot
+mining-drone-drones=Mining drones
 mining-drone-mining-speed=Mining drone mining speed
 mining-drone-productivity=Mining drone productivity
 mine=Mine __1__

shared.lua

@@ -13,6 +13,7 @@ data.mining_depot_chest_v = "mining-depot-chest-v"
 data.variation_count = 20
 data.mining_drone_collision_mask = {"error-fix-me"}
 
+data.mining_drone_technology = "mining-drone-drones"
 data.mining_speed_technology = "mining-drone-mining-speed"
 data.mining_productivity_technology = "mining-drone-productivity"