feat: instance node

docs/PLANTARIUM.md

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+# Plantarium Documentation
+
+## Encoding Scheme
+
+Plantarium encodes different types of data differently. Right now we have three types of data:
+
+### Path
+[0, stem_depth, ... x,y,z,thickness, x,y,z,thickness...]
+
+### Geometry
+[1, vertex_amount, face_amount, ... faces in index_a, index_b, index_c ..., ... vertices in x,y,z,x,y,z ..., ... normals in x,y,z,x,y,z ...]
+
+### Instances
+[
+  2, 
+  vertex_amount, 
+  face_amount,  
+  instance_amount, 
+  stem_depth, 
+  ...faces..., 
+  ...vertices..., 
+  ...normals..., 
+  ...4x4 matrices for instances...
+]
+