Outlined the solve page structure

Author: ikorotkin

docs/examples.md

@@ -9,8 +9,9 @@ Work in progress
 
 # Examples
 
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+## Quick Start
 
-## Subtitle
+## Simple DAE
+
+## Perovskite model
 
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docs/solve.md

@@ -9,8 +9,28 @@ Work in progress
 
 # Solving DAE system
 
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+Once the DAE system is defined (see [Classes to define DAE system](classes.html)), we are ready to start solving it.
+Generally, there are two ways of calling the main `dae-cpp` solver from the program and start computation:
 
-## Subtitle
+- Use the [`System`](#system-class) class, which serves as a wrapper for the lower-level [`daecpp::solve(...)`](#daecppsolve-function) function. The class [`System`](#system-class) contains the [Solver Options](solver-options.html) and [Solution Holder](solution-manager.html#solution-holder-class) objects. The latter is used to save the solution vector every time step. Both objects are public members of the [`System`](#system-class) class and can be accessed by the user. It's a very easy class to use (see [Quick Start example](quick-start.html)), but it does not allow the user to define a custom [Solution Manager](solution-manager.html).
+- Use the lower-level [`daecpp::solve(...)`](#daecppsolve-function) function directly, providing the user-defined [DAE system classes](#system-class), [Solver Options](solver-options.html), [Solution Manager](solution-manager.html), etc., as arguments. This is a more flexible approach (see [Simple DAE](https://github.com/dae-cpp/dae-cpp/blob/master/examples/simple_dae/simple_dae.cpp) example).
 
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+In this section, we consider both approaches to start the computation.
+
+## `System` class
+
+Serves as a wrapper for lower level [`daecpp::solve(...)`](#daecppsolve-function) function calls. Contains the [Solver Options](solver-options.html) and [Solution Holder](solution-manager.html#solution-holder-class) objects.
+
+### `System` class public members
+
+### `System` class constructor
+
+### `System` class `solve(...)` method
+
+### Example
+
+## `daecpp::solve(...)` function
+
+Integrates the system of DAEs.
+
+### Example

docs/utilities.md

@@ -13,7 +13,3 @@ TODO:
 
 - [ ] Get solver version
 - [ ] Timer
-
-## Subtitle
-
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