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add documentation for get, ps

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# get
Open given cells as text.
Syntax: `get ...args`
### Parameters:
* `args`: optionally return additional data by path
## Examples
If we run `sys` we recieve a table which contains tables itself:
```shell
> sys
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┯━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┯━━━━━━━━━━━━━━━━┯━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┯━━━━━━━━━━━━━━━━┯━━━━━━━━━━━━━━━━┯━━━━━━━━━━━━━━━━
host │ cpu │ disks │ mem │ temp │ net │ battery
────────────────────────────────────────┼────────────────────────────────────┼────────────────┼───────────────────────────────────────┼────────────────┼────────────────┼────────────────
[row arch hostname name release uptime │ [row cores current ghz max ghz min │ [table 7 rows] │ [row free swap free swap total total] │ [table 6 rows] │ [table 3 rows] │ [table 1 rows]
users] │ ghz] │ │ │ │ │
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┷━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┷━━━━━━━━━━━━━━━━┷━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┷━━━━━━━━━━━━━━━━┷━━━━━━━━━━━━━━━━┷━━━━━━━━━━━━━━━━
```
To access one of the embeded tables we can use the `get` command
```shell
> sys | get cpu
━━━━━━━┯━━━━━━━━━━━━━━━━━━━┯━━━━━━━━━━━━━━━━━━━━┯━━━━━━━━━━━━━━━━━━━
cores │ current ghz │ min ghz │ max ghz
───────┼───────────────────┼────────────────────┼───────────────────
4 │ 1.530000000000000 │ 0.5000000000000000 │ 3.500000000000000
━━━━━━━┷━━━━━━━━━━━━━━━━━━━┷━━━━━━━━━━━━━━━━━━━━┷━━━━━━━━━━━━━━━━━━━
```
```shell
> sys | get battery
━━━━━━━━┯━━━━━━━━━━┯━━━━━━━━━━━━━━━━━━
vendor │ model │ mins to full
────────┼──────────┼──────────────────
SMP │ L14M2P21 │ 16.7024000000000
━━━━━━━━┷━━━━━━━━━━┷━━━━━━━━━━━━━━━━━━
```
There's also the ability to pass multiple parameters to `get` which results in an output like this
```shell
sys | get cpu battery
━━━┯━━━━━━━┯━━━━━━━━━━━━━━━━━━━┯━━━━━━━━━━━━━━━━━━━━┯━━━━━━━━━━━━━━━━━━━┯━━━━━━━━┯━━━━━━━━━━┯━━━━━━━━━━━━━━━━━━━
# │ cores │ current ghz │ min ghz │ max ghz │ vendor │ model │ mins to full
───┼───────┼───────────────────┼────────────────────┼───────────────────┼────────┼──────────┼───────────────────
0 │ 4 │ 1.500000000000000 │ 0.5000000000000000 │ 3.500000000000000 │ │ │
1 │ │ │ │ │ SMP │ L14M2P21 │ 16.94503000000000
━━━┷━━━━━━━┷━━━━━━━━━━━━━━━━━━━┷━━━━━━━━━━━━━━━━━━━━┷━━━━━━━━━━━━━━━━━━━┷━━━━━━━━┷━━━━━━━━━━┷━━━━━━━━━━━━━━━━━━━
```

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# ps
This command shows information about system processes.
Syntax: `ps`
## Example
```shell
> ps
...
━━━━┯━━━━━━━┯━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┯━━━━━━━━━┯━━━━━━━━━━━━━━━━━━━
# │ pid │ name │ status │ cpu
────┼───────┼────────────────────────────────────────────────────────────────────┼─────────┼───────────────────
50 │ 10184 │ firefox.exe │ Running │ 0.000000000000000
51 │ 11584 │ WindowsTerminal.exe │ Running │ 0.000000000000000
52 │ 11052 │ conhost.exe │ Running │ 0.000000000000000
53 │ 7076 │ nu.exe │ Running │ 0.000000000000000
...
66 │ 3000 │ Code.exe │ Running │ 0.000000000000000
67 │ 5388 │ conhost.exe │ Running │ 0.000000000000000
68 │ 6268 │ firefox.exe │ Running │ 0.000000000000000
69 │ 8972 │ nu_plugin_ps.exe │ Running │ 58.00986000000000
━━━━┷━━━━━━━┷━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┷━━━━━━━━━┷━━━━━━━━━━━━━━━━━━━
```