Add "getting started" docs #244

Job	Run time
Rustfmt	11s
Test example (actix, stable)	56s
Test example (actix, nightly)	47s
Test (stable)	14s
Test example (axum, stable)	32s
Test (1.75.0)	15s
Test example (axum, nightly)	32s
Test (1.67.1)	2m 0s
Test example (gotham, stable)	39s
Test (1.63.0)	1m 57s
Test example (gotham, nightly)	36s
Test (beta)	15s
Test example (simple, stable)	15s
Test (nightly)	14s
Test example (simple, nightly)	13s
Test example (static-sass, stable)	26s
Test example (static-sass, nightly)	24s
Test example (statics, stable)	13s
Test example (statics, nightly)	15s
Test example (tide, stable)	47s
Test example (tide, nightly)	42s
Test example (warp03, stable)	42s
Test example (warp03, nightly)	44s
	13m 49s

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