Add TextasticPro tweak, assets, and update README

TextasticPro/index.md

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+# TextasticPro
+
+Unlocks premium features in Textastic.
+
+- **App**: [Textastic](https://apps.apple.com/fr/app/textastic/id572491815?l=en-GB&mt=12)
+- **Tested on**: Textastic 10.9.2, iOS iOS 18.3
+
+## Build
+
+```sh
+make clean && make package THEOS_PACKAGE_SCHEME=rootless DEBUG=0
+```
+
+## Inject
+
+```sh
+cyan -i com.textasticapp.textastic-universal-10.9.2.ipa \
+     -o com.textasticapp.textastic-universal-10.9.2_patched.ipa \
+     -f xxyz.nohamr.textasticpro_1.0.0-1_iphoneos-arm64.deb \
+     -u
+```
+
+## Screenshots
+
+![../docs/screens/TextasticPro/pro.png](../docs/screens/TextasticPro/pro.png)
+![../docs/screens/TextasticPro/search.png](../docs/screens/TextasticPro/search.png)
+![../docs/screens/TextasticPro/shh1.png](../docs/screens/TextasticPro/ssh1.png)
+![../docs/screens/TextasticPro/ssh2.png](../docs/screens/TextasticPro/ssh2.png)