add picture made by anarcat

docs/misc/internals-picture.txt

@@ -0,0 +1,41 @@
+BorgBackup from 10.000m
+=======================
+
++--------+ +--------+     +--------+
+|archive0| |archive1| ... |archiveN|
++--------+ +--------+     +--+-----+
+    |          |             |
+    |          |             |
+    |      +---+             |
+    |      |                 |
+    |      |                 |
+    +------+-------+         |
+    |      |       |         |
+ /chunk\/chunk\/chunk\...   /maybe different chunks lists\ 
++-----------------------------------------------------------------+
+|item list                                                        |
++-----------------------------------------------------------------+
+    |                                                       
+    +-------------------------------------+--------------+  
+    |                                     |              |  
+    |                                     |              |  
++-------------+                     +-------------+      |  
+|item0        |                     |item1        |      |  
+| - owner     |                     | - owner     |      |  
+| - size      |                     | - size      |     ... 
+| - ...       |                     | - ...       |         
+| - chunks    |                     | - chunks    |         
++----+--------+                     +-----+-------+         
+     |                                    |                 
+     | +-----+----------------------------+-----------------+
+     | |     |                                              |
+     +-o-----o------------+                                 |
+     | |     |            |                                 |
+  /chunk0\/chunk1\ ... /chunkN\     /chunk0\/chunk1\ ... /chunkN'\
+ +-----------------------------+   +------------------------------+
+ |file0                        |   |file0'                        |
+ +-----------------------------+   +------------------------------+
+
+
+Thanks to anarcat for drawing the picture!
+