feat(challenges): add look-and-say-sequence-conway

challenges/look-and-say-sequence-conway/README.md

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+# look-and-say-sequence-conway
+
+Created by [@Divlo](https://github.com/Divlo) on 30 November 2021.
+
+## Instructions
+
+In mathematics, the **look-and-say sequence** is the sequence of integers beginning as follows: `1, 11, 21, 1211, 111221, 312211, 13112221, 1113213211, ...`.
+
+The look-and-say sequence was introduced and analyzed by John **Conway**.
+
+To generate a member of the sequence from the previous member, read off the digits of the previous member, counting the number of digits in groups of the same digit. For example:
+
+- `1` is read off as "one 1" or 11.
+- `11` is read off as "two 1s" or 21.
+- `21` is read off as "one 2, then one 1" or 1211.
+- `1211` is read off as "one 1, one 2, then two 1s" or 111221.
+- `111221` is read off as "three 1s, two 2s, then one 1" or 312211.
+
+Write a program that prints the next term of the **look-and-say sequence**.
+
+## Source
+
+- [Look-and-say sequence - Wikipedia](https://en.wikipedia.org/wiki/Look-and-say_sequence)
+
+## Examples
+
+### Example 1
+
+#### Input
+
+```txt
+11
+```
+
+#### Output
+
+```txt
+21
+```
+
+### Example 2
+
+#### Input
+
+```txt
+1211
+```
+
+#### Output
+
+```txt
+111221
+```
+
+See the `test` folder for examples of input/output.

challenges/look-and-say-sequence-conway/test/1/input.txt

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+11

challenges/look-and-say-sequence-conway/test/1/output.txt

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+21

challenges/look-and-say-sequence-conway/test/10/input.txt

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+98765421

challenges/look-and-say-sequence-conway/test/10/output.txt

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+1918171615141211

challenges/look-and-say-sequence-conway/test/2/input.txt

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+1211

challenges/look-and-say-sequence-conway/test/2/output.txt

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+111221

challenges/look-and-say-sequence-conway/test/3/input.txt

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+1312211231131112311211232221121321132132211331121321231231121113112221121321133112132112312321123113112221121113122113121113123112112322111213

challenges/look-and-say-sequence-conway/test/3/output.txt

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+111311222112132113311213211221121332211211131221131211132221232112111312111213111213211231132132211211131221232112111312211213111213122112132113213221123113112221131112311311121321122112132231121113

challenges/look-and-say-sequence-conway/test/4/input.txt

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+1

challenges/look-and-say-sequence-conway/test/4/output.txt

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+11

challenges/look-and-say-sequence-conway/test/5/input.txt

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+3113112221232112111312211312113211

challenges/look-and-say-sequence-conway/test/5/output.txt

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+1321132132111213122112311311222113111221131221

challenges/look-and-say-sequence-conway/test/6/input.txt

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+1113213211

challenges/look-and-say-sequence-conway/test/6/output.txt

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+31131211131221

challenges/look-and-say-sequence-conway/test/7/input.txt

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+11189

challenges/look-and-say-sequence-conway/test/7/output.txt

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+311819

challenges/look-and-say-sequence-conway/test/8/input.txt

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+111895647

challenges/look-and-say-sequence-conway/test/8/output.txt

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+31181915161417

challenges/look-and-say-sequence-conway/test/9/input.txt

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+123456789

challenges/look-and-say-sequence-conway/test/9/output.txt

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+111213141516171819