missing doc file

Author: chmerdon

docs/src/solvers.md

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+# Solver
+
+Solving requires a spatial and stochastic discretization.
+Both are connected in a special vector structure
+that is passed to a solve function that runs a special
+iterative solver for each model problem.
+
+## SGFEVector
+
+The spatial discretization is represented by
+s single finite element space from [ExtendableFEM.jl](https://github.com/WIAS-PDELib/ExtendableFEM.jl),
+while the stochastic discretization is represented by a tensorized basis
+for the parameter space of the stochastic coefficient. Both have to be prepared in
+advance.
+
+!!! note
+
+    Currently it is not possible to used different finite element spaces for different multi-indices,
+    but this feature might be added in the future.
+
+```@autodocs
+Modules = [ExtendableASGFEM]
+Pages = ["sgfevector.jl"]
+Order   = [:type, :function]
+```
+
+## Solve function
+
+```@autodocs
+Modules = [ExtendableASGFEM]
+Pages = ["modelproblems/modelproblems.jl"]
+Order   = [:type, :function]
+```