doc: Add channel introduction.

Julien LepillerSat Jul 25 20:30:45+0200 2020

01a3d95

doc: Add channel introduction. * README.md: Add channel introduction in installation instructions. * doc/install.md: idem.

README.md

2525 
```scheme
2626 
(cons* (channel
2727 
        (name 'guix-home-manager)
28-
        (url "https://framagit.org/tyreunom/guix-home-manager.git"))
28+
        (url "https://framagit.org/tyreunom/guix-home-manager.git")
29+
        (introduction
30+
          (make-channel-introduction
31+
            "897c1a470da759236cc11798f4e0a5f7d4d59fbc"
32+
            (openpgp-fingerprint
33+
              "2A39 3FFF 68F4 EF7A 3D29  12AF 6F51 20A0 22FB B2D5"))))
2934 
       %default-channels)
3035 
```
3136 
doc/install.md
1111 
```scheme
1212 
(cons* (channel
1313 
        (name 'guix-home-manager)
14-
        (url "https://framagit.org/tyreunom/guix-home-manager.git"))
14+
        (url "https://framagit.org/tyreunom/guix-home-manager.git")
15+
        (introduction
16+
          (make-channel-introduction
17+
            "897c1a470da759236cc11798f4e0a5f7d4d59fbc"
18+
            (openpgp-fingerprint
19+
              "2A39 3FFF 68F4 EF7A 3D29  12AF 6F51 20A0 22FB B2D5"))))
1520 
       %default-channels)
1621 
```
1722