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Merge pull request #948 from coolshaurya/docs-pick-reject

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Add documentation for the pick and reject command
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# pick
This command displays only the column names passed on to it.
## Examples
```shell
> ls
━━━┯━━━━━━━━━━━━━━━━━━━━━━━━━━━━┯━━━━━━┯━━━━━━━━━━┯━━━━━━━━┯━━━━━━━━━━━━━┯━━━━━━━━━━━━━┯━━━━━━━━━━━━━
# │ name │ type │ readonly │ size │ created │ accessed │ modified
───┼────────────────────────────┼──────┼──────────┼────────┼─────────────┼─────────────┼─────────────
0 │ zeusiscrazy.txt │ File │ │ 556 B │ a month ago │ a month ago │ a month ago
1 │ coww.txt │ File │ │ 24 B │ a month ago │ a month ago │ a month ago
2 │ randomweirdstuff.txt │ File │ │ 197 B │ a month ago │ a month ago │ a month ago
3 │ abaracadabra.txt │ File │ │ 401 B │ a month ago │ a month ago │ a month ago
4 │ youshouldeatmorecereal.txt │ File │ │ 768 B │ a month ago │ a month ago │ a month ago
━━━┷━━━━━━━━━━━━━━━━━━━━━━━━━━━━┷━━━━━━┷━━━━━━━━━━┷━━━━━━━━┷━━━━━━━━━━━━━┷━━━━━━━━━━━━━┷━━━━━━━━━━━━━
> ls | pick name
━━━┯━━━━━━━━━━━━━━━━━━━━━━━━━━━━
# │ name
───┼────────────────────────────
0 │ zeusiscrazy.txt
1 │ coww.txt
2 │ randomweirdstuff.txt
3 │ abaracadabra.txt
4 │ youshouldeatmorecereal.txt
━━━┷━━━━━━━━━━━━━━━━━━━━━━━━━━━━
```
The order in which you put the column names matters:
```shell
> ls | pick type name size
━━━┯━━━━━━┯━━━━━━━━━━━━━━━━━━━━━━━━━━━━┯━━━━━━━━
# │ type │ name │ size
───┼──────┼────────────────────────────┼────────
0 │ File │ zeusiscrazy.txt │ 556 B
1 │ File │ coww.txt │ 24 B
2 │ File │ randomweirdstuff.txt │ 197 B
3 │ File │ abaracadabra.txt │ 401 B
4 │ File │ youshouldeatmorecereal.txt │ 768 B
━━━┷━━━━━━┷━━━━━━━━━━━━━━━━━━━━━━━━━━━━┷━━━━━━━━
> ls | pick size type name
━━━┯━━━━━━━━┯━━━━━━┯━━━━━━━━━━━━━━━━━━━━━━━━━━━━
# │ size │ type │ name
───┼────────┼──────┼────────────────────────────
0 │ 556 B │ File │ zeusiscrazy.txt
1 │ 24 B │ File │ coww.txt
2 │ 197 B │ File │ randomweirdstuff.txt
3 │ 401 B │ File │ abaracadabra.txt
4 │ 768 B │ File │ youshouldeatmorecereal.txt
━━━┷━━━━━━━━┷━━━━━━┷━━━━━━━━━━━━━━━━━━━━━━━━━━━━
```

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# reject
This column removes or rejects the columns passed to it.
## Examples
```shell
> ls
━━━┯━━━━━━━━━━━━━━━━━━━━━━━━━━━━┯━━━━━━┯━━━━━━━━━━┯━━━━━━━━┯━━━━━━━━━━━━━┯━━━━━━━━━━━━━┯━━━━━━━━━━━━━
# │ name │ type │ readonly │ size │ created │ accessed │ modified
───┼────────────────────────────┼──────┼──────────┼────────┼─────────────┼─────────────┼─────────────
0 │ zeusiscrazy.txt │ File │ │ 556 B │ a month ago │ a month ago │ a month ago
1 │ coww.txt │ File │ │ 24 B │ a month ago │ a month ago │ a month ago
2 │ randomweirdstuff.txt │ File │ │ 197 B │ a month ago │ a month ago │ a month ago
3 │ abaracadabra.txt │ File │ │ 401 B │ a month ago │ a month ago │ a month ago
4 │ youshouldeatmorecereal.txt │ File │ │ 768 B │ a month ago │ a month ago │ a month ago
━━━┷━━━━━━━━━━━━━━━━━━━━━━━━━━━━┷━━━━━━┷━━━━━━━━━━┷━━━━━━━━┷━━━━━━━━━━━━━┷━━━━━━━━━━━━━┷━━━━━━━━━━━━━
> ls | reject readonly
━━━┯━━━━━━━━━━━━━━━━━━━━━━━━━━━━┯━━━━━━┯━━━━━━━━┯━━━━━━━━━━━━━┯━━━━━━━━━━━━━┯━━━━━━━━━━━━━
# │ name │ type │ size │ created │ accessed │ modified
───┼────────────────────────────┼──────┼────────┼─────────────┼─────────────┼─────────────
0 │ zeusiscrazy.txt │ File │ 556 B │ a month ago │ a month ago │ a month ago
1 │ coww.txt │ File │ 24 B │ a month ago │ a month ago │ a month ago
2 │ randomweirdstuff.txt │ File │ 197 B │ a month ago │ a month ago │ a month ago
3 │ abaracadabra.txt │ File │ 401 B │ a month ago │ a month ago │ a month ago
4 │ youshouldeatmorecereal.txt │ File │ 768 B │ a month ago │ a month ago │ a month ago
━━━┷━━━━━━━━━━━━━━━━━━━━━━━━━━━━┷━━━━━━┷━━━━━━━━┷━━━━━━━━━━━━━┷━━━━━━━━━━━━━┷━━━━━━━━━━━━━
> ls | reject readonly accessed
━━━┯━━━━━━━━━━━━━━━━━━━━━━━━━━━━┯━━━━━━┯━━━━━━━━┯━━━━━━━━━━━━━┯━━━━━━━━━━━━━
# │ name │ type │ size │ created │ modified
───┼────────────────────────────┼──────┼────────┼─────────────┼─────────────
0 │ zeusiscrazy.txt │ File │ 556 B │ a month ago │ a month ago
1 │ coww.txt │ File │ 24 B │ a month ago │ a month ago
2 │ randomweirdstuff.txt │ File │ 197 B │ a month ago │ a month ago
3 │ abaracadabra.txt │ File │ 401 B │ a month ago │ a month ago
4 │ youshouldeatmorecereal.txt │ File │ 768 B │ a month ago │ a month ago
━━━┷━━━━━━━━━━━━━━━━━━━━━━━━━━━━┷━━━━━━┷━━━━━━━━┷━━━━━━━━━━━━━┷━━━━━━━━━━━━━
```