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I want to display a table in readme.md file. I read GitHub Flavored Markdown and followed what it said. So this is my table:

| Attempt | #1 | #2 | #3 | #4 | #5 | #6 | #7 | #8 | #9 | #10 | #11 | #12 |
| :---: | :---: | :---: | :---: | :---: | :---: | :---: | :---: | :---: | :---: | :---: | :---: | :---: |
| Seconds | 301 | 283 | 290 | 286 | 289 | 285 | 287 | 287 | 272 | 276 | 269 | 254 |

However, I don't see any table and result looks like:

Answers

You need to see documentation again. You can see this cheatsheet

In your case you need to make second line like in example below:

Attempt | #1 | #2 | #3 | #4 | #5 | #6 | #7 | #8 | #9 | #10 | #11
--- | --- | --- | --- |--- |--- |--- |--- |--- |--- |--- |---
Seconds | 301 | 283 | 290 | 286 | 289 | 285 | 287 | 287 | 272 | 276 | 269

difference between this code and your code in repo is that second line with separator has same columns as header. After that this table will be shown