Add sign symmetric tutorial

[codecov[bot]]

Codecov Report

Base: 78.17% // Head: 78.46% // Increases project coverage by +0.29% :tada:

Coverage data is based on head (ef07bdd) compared to base (a4e1a6a). Patch has no changes to coverable lines.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #258 +/- ## ========================================== + Coverage 78.17% 78.46% +0.29% ========================================== Files 36 36 Lines 1700 1788 +88 ========================================== + Hits 1329 1403 +74 - Misses 371 385 +14 ``` | [Impacted Files](https://codecov.io/gh/jump-dev/SumOfSquares.jl/pull/258?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=jump-dev) | Coverage Δ | | |---|---|---| | [src/variable.jl](https://codecov.io/gh/jump-dev/SumOfSquares.jl/pull/258/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=jump-dev#diff-c3JjL3ZhcmlhYmxlLmps) | `82.85% <0.00%> (-5.03%)` | :arrow_down: | | [src/Certificate/Symmetry/utils.jl](https://codecov.io/gh/jump-dev/SumOfSquares.jl/pull/258/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=jump-dev#diff-c3JjL0NlcnRpZmljYXRlL1N5bW1ldHJ5L3V0aWxzLmps) | `61.29% <0.00%> (-3.00%)` | :arrow_down: | | [src/Certificate/Sparsity/sign.jl](https://codecov.io/gh/jump-dev/SumOfSquares.jl/pull/258/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=jump-dev#diff-c3JjL0NlcnRpZmljYXRlL1NwYXJzaXR5L3NpZ24uamw=) | `100.00% <0.00%> (ø)` | | | [src/Certificate/Sparsity/monomial.jl](https://codecov.io/gh/jump-dev/SumOfSquares.jl/pull/258/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=jump-dev#diff-c3JjL0NlcnRpZmljYXRlL1NwYXJzaXR5L21vbm9taWFsLmps) | `100.00% <0.00%> (ø)` | | | [src/Certificate/Sparsity/variable.jl](https://codecov.io/gh/jump-dev/SumOfSquares.jl/pull/258/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=jump-dev#diff-c3JjL0NlcnRpZmljYXRlL1NwYXJzaXR5L3ZhcmlhYmxlLmps) | `100.00% <0.00%> (ø)` | | | [src/Certificate/Symmetry/block\_diag.jl](https://codecov.io/gh/jump-dev/SumOfSquares.jl/pull/258/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=jump-dev#diff-c3JjL0NlcnRpZmljYXRlL1N5bW1ldHJ5L2Jsb2NrX2RpYWcuamw=) | `0.00% <0.00%> (ø)` | | | [src/Certificate/Symmetry/wedderburn.jl](https://codecov.io/gh/jump-dev/SumOfSquares.jl/pull/258/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=jump-dev#diff-c3JjL0NlcnRpZmljYXRlL1N5bW1ldHJ5L3dlZGRlcmJ1cm4uamw=) | `0.00% <0.00%> (ø)` | | | [src/Bridges/Constraint/sos\_polynomial.jl](https://codecov.io/gh/jump-dev/SumOfSquares.jl/pull/258/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=jump-dev#diff-c3JjL0JyaWRnZXMvQ29uc3RyYWludC9zb3NfcG9seW5vbWlhbC5qbA==) | `100.00% <0.00%> (ø)` | | | [...c/Bridges/Constraint/scaled\_diagonally\_dominant.jl](https://codecov.io/gh/jump-dev/SumOfSquares.jl/pull/258/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=jump-dev#diff-c3JjL0JyaWRnZXMvQ29uc3RyYWludC9zY2FsZWRfZGlhZ29uYWxseV9kb21pbmFudC5qbA==) | `0.00% <0.00%> (ø)` | | | [src/Certificate/newton\_polytope.jl](https://codecov.io/gh/jump-dev/SumOfSquares.jl/pull/258/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=jump-dev#diff-c3JjL0NlcnRpZmljYXRlL25ld3Rvbl9wb2x5dG9wZS5qbA==) | `99.19% <0.00%> (+0.05%)` | :arrow_up: | | ... and [8 more](https://codecov.io/gh/jump-dev/SumOfSquares.jl/pull/258/diff?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=jump-dev) | | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=jump-dev). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=jump-dev)

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