Docs: Create a simple draft of the documentaiton

[DawidWesierski4]

Simple draft of the documentation for the MTL
gstreamer plugin.

[skolelis]

add. section numbers:

1.

2.

1.1.

2.2.

etc.

[lcybura]

add. section numbers:

1.

2.

1.1.

2.2.

etc.

it is not pure documentation, for final version we will have time after feature completion. Now it should be part of code as it is (in my opinion is enough)

[DawidWesierski4]

add. section numbers:

1.

2.

1.1.

2.2.

etc.

it is not pure documentation, for final version we will have time after feature completion. Now it should be part of code as it is (in my opinion is enough)

No no no no this is a draft, but lets not do half measures,

We can just use this as a starting point, for now there are too many "unknowns" to actually put this in repository,

When this PR will be production ready we can put it in-rewiew stage after triage and some basic testing

As said this is draft not a final produce it will go into "in-rewiew" stage in much more compleated form