add english version of resources.md

doc/en/main-page.md

@@ -12,3 +12,5 @@
 - [Scripting](scripting.md)
 - [Console](console.md)
 - [Block models](block-models.md)
+- [Rigging](rigging.md)
+- [Resources (resources.json)](resources.md)

doc/en/resources.md

@@ -0,0 +1,22 @@
+# Resources
+
+Resources include:
+- cameras
+- effects slots
+- framebuffers
+- and other limited resources
+
+At the moment only **cameras** are implemented.
+
+The resources requested by the pack are specified through the *resources.json* file in the format:
+```json
+{
+    "resource-type": [
+        "resources",
+        "names"
+    ]
+}
+```
+
+After loading the pack, resource names will have the pack prefix. For example camera
+*cinematic* in the base package will be *base:cinematic*.