docs: add doc files

docs/ref/epmodel.md

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+::: frads.EPModel
+
+::: frads.epjson2rad.epjson2rad

docs/ref/epsetup.md

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+::: frads.EnergyPlusSetup

docs/ref/fivephase.md

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+::: frads.FivePhaseMethod

docs/ref/matrix.md

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+Frads Matrix class simply encapsulate the components
+necessary to generate a matrix, such as ray sender and 
+receiver. The matrix data is by default store as numpy 
+array in memory for later access.
+
+
+::: frads.Matrix
+
+::: frads.SensorSender
+
+::: frads.ViewSender
+
+::: frads.SurfaceSender
+
+::: frads.SkyReceiver
+
+::: frads.SurfaceReceiver
+
+::: frads.SunMatrix
+
+::: frads.SunReceiver
+
+::: frads.load_matrix 
+
+::: frads.load_binary_matrix
+
+::: frads.surfaces_view_factor

docs/ref/sky.md

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+::: frads.gen_perez_sky
+::: frads.genskymtx
+

docs/ref/threephase.md

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+::: frads.ThreePhaseMethod

docs/ref/twophase.md

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+::: frads.TwoPhaseMethod

docs/ref/window.md

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+
+::: frads.GlazingSystem
+

docs/why.md

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+# Why use frads
+
+Matrix algebraic methods reduce the time needed to perform accurate,
+ray-tracing based, annual daylight simulations by several orders of
+magnitude. A good deal of expertise is needed to set up the simulations
+properly to achieve the desired level of accuracy.
+frads provides users with tools (e.g., `mrad`) that automatically
+determine which matrix-based method to use then sets the associated
+simulation parameters, helping beginners learn the different matrix
+methods by observing the tools’ behavior. The user is still required
+to understand basic concepts underlying matrix-based simulation methods
+(see [tutorials](https://www.radiance-online.org/learning/tutorials)).
+
+Matrix-based methods also enable accurate, ray-tracing generated,
+irradiance, illuminance, and luminance data to be available for
+run-time data exchange and co-simulations. frads provides users with
+tools that generate the appropriate Radiance-generated
+data then interfaces with the “actuator” EMS module in EnergyPlus or
+within the Spawn-of-EnergyPlus and Modelica co-simulation environment.
+This enables end users to evaluate the performance of buildings with
+manual- and automatically-controlled shading and daylighting systems
+or other site and building features that can change parametrically
+or on a time-step basis.