Add compute pages

Author: kabilar

docs/src/compute/distributed.md

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+## Work in progress
+You may ask questions in the chat window below or
+refer to [legacy documentation](https://docs.datajoint.org/)

docs/src/compute/key-source.md

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+## Work in progress
+You may ask questions in the chat window below or
+refer to [legacy documentation](https://docs.datajoint.org/)

docs/src/compute/make.md

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+# Make Method
+
+For auto-populated *Imported* and *Computed* tables[^1], a `make` method gives exact
+instructions for generating the content. By making these steps explicit, we keep a
+careful record of data provenance and ensure reproducibility. Data should never be
+entered using the `insert` method directly.
+
+[^1]: For information on differentiating these data tiers, see the Table Tier section on
+[Automation](../tabletiers#automation-imported-and-computed).
+
+The `make` method receives one argument: the *key*, which represents the upstream table
+entries that need populating. The `key` is a `dict` or `struct` in Python and Matlab,
+respectively. 
+
+A `make` function should do three things:
+
+1.  [Fetch](../../query-lang/common-commands#fetch) data from tables upstream in the
+pipeline using the key for restriction.
+
+2.  Compute and add any missing attributes to the fields already in the key.
+
+3.  [Inserts](../../query-lang/common-commands#insert) the entire entity into the
+triggering table.
+
+## Populate
+
+The `make` method is sometimes referred to as the `populate` function because this is
+the class method called to run the `make` method on all relevant keys[^2].
+
+[^2]: For information on reprocessing keys that resulted in an error, see information
+on the [Jobs table](../../ref-integrity/distributed-computing). 
+
+=== "Python"
+
+    ``` python
+    Segmentation.populate()
+    ```    
+
+=== "Matlab"
+
+    In Matlab, the `key` is a `struct`. 
+    ``` matlab
+    populate(Segmentation)
+    ```
+
+For more information on the `populate` options in each language, please visit the 
+[Python and Matlab](../../../) documentation pages.
+
+<!-- TODO: Replace above with respective links when live -->

docs/src/compute/populate.md

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+## Work in progress
+You may ask questions in the chat window below or
+refer to [legacy documentation](https://docs.datajoint.org/)