Docs autoview pwd touch (#2068)

* [ADD] Add draft documentation for autoview

* [ADD] Add draft documentation for pwd

* [ADD] Add draft documentation for touch

* [MOD] Improve description and add examples

Add the use of `textview` and `binaryview`.
Add examples for single value, source file and binary file.

docs/commands/autoview.md

@@ -0,0 +1,59 @@
+# autoview
+
+Print the content of the pipeline as a table or list.
+It is the implied or default viewer when none is provided.
+
+When reading a single value, a table or a list, `autoview` will attempt to view it.
+When reading a string that originally comes from a source file it will attempt
+to use `textview`.
+When reading a binary file it will attempt to display its content as hexadecimal
+numbers and the corresponding characters.
+
+`-h`, `--help`
+  Display help message.
+
+## Examples
+
+In all following examples `autoview` can be removed with no change in the output.
+The use of `autoview` at the end of the pipeline is implied when no viewer is
+explicitly used.
+
+```shell
+> which nu | get path | autoview
+/home/me/.cargo/bin/nu
+```
+
+```shell
+> ls | autoview
+────┬────────────────────┬──────┬─────────┬──────────────
+ #  │ name               │ type │ size    │ modified
+────┼────────────────────┼──────┼─────────┼──────────────
+  0 │ README.md          │ File │   932 B │ 19 hours ago
+  1 │ alias.md           │ File │  2.0 KB │ 19 hours ago
+  2 │ append.md          │ File │  1.4 KB │ 19 hours ago
+   ...
+ 82 │ wrap.md            │ File │  1.8 KB │ 19 hours ago
+────┴────────────────────┴──────┴─────────┴──────────────
+```
+
+```shell
+> echo "# Hi" "## Section" "Some text" | save file.md
+> open file.md | autoview
+# Hi
+## Section
+Some text
+```
+
+`autoview` will use `textview` to colorize the text based on the file format.
+The style used by `textview` can be configured in `config.toml`.
+
+```shell
+> open --raw $(which nu | get path) | autoview
+...
+126d1c0:   64 31 66 37  62 30 31 63  36 2e 31 31  38 2e 6c 6c   d1f7b01c6.118.ll
+126d1d0:   76 6d 2e 34  34 38 37 35  37 31 32 34  39 35 33 39   vm.4487571249539
+126d1e0:   34 34 30 34  30 39 00 61  6e 6f 6e 2e  30 30 61 63   440409.anon.00ac
+126d1f0:   37 32 65 36  37 66 32 31  39 34 62 32  32 61 61 63   72e67f2194b22aac
+126d200:   62 35 39 37  33 36 30 62  64 31 39 38  2e 31 36 2e   b597360bd198.16.
+...
+```

docs/commands/pwd.md

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+# pwd
+
+Print the current working directory.
+
+`-h`, `--help`
+  Display help message.
+
+## Examples
+
+```shell
+> pwd
+/home/me/nushell/docs/commands
+```
+
+```shell
+> pwd | split column "/" | reject Column1 | pivot | reject Column0
+───┬──────────
+ # │ Column1
+───┼──────────
+ 0 │ home
+ 1 │ me
+ 2 │ projects
+ 3 │ nushell
+ 4 │ docs
+ 5 │ commands
+───┴──────────
+```

docs/commands/touch.md

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+# touch
+
+Create a file in the current or an already existent directory.
+It has no effect on existing files.
+Unlike GNU touch, the access time and the modified time are not updated.
+
+`-h`, `--help`
+  Display help message.
+
+## Examples
+
+Create a file in an empty folder. Then touch the file and list files again to observe that the modified time has not been updated.
+
+```shell
+> ls
+> touch file.ext; ls
+──────────┬─────────────
+ name     │ file.ext
+ type     │ File
+ size     │ 0 B
+ modified │ 0 secs ago
+──────────┴─────────────
+> touch file.ext; ls
+──────────┬───────────
+ name     │ file.ext
+ type     │ File
+ size     │ 0 B
+ modified │ 10 secs ago
+──────────┴───────────
+```
+
+Create a file within an already existent folder.
+
+```shell
+> mkdir dir
+> touch dir/file.ext; ls dir
+──────────┬───────────
+ name     │ dir/file.ext
+ type     │ File
+ size     │ 0 B
+ modified │ 0 secs ago
+──────────┴───────────
+```