chore: add document about qTox TCS support state

doc/TCS_state.md

@@ -0,0 +1,55 @@
+# qTox TCS Support state
+
+All section number refer to a section in the [TCS document].
+
+|Symbol|Description|
+|------|-----------|
+|Y| qTox implements this point|
+|N| qTox is missing this point, add issue number|
+|U| Unknown if qTox supports this point|
+
+|TCS Section | qTox State |
+|------------|------------|
+| 1.0.1  |U|
+| 1.0.2  |U|
+| 1.0.3  |U|
+| 1.0.4  |U|
+| 2.1.1  |U|
+| 2.1.2  |U|
+| 2.2.1  |U|
+| 2.2.2  |U|
+| 2.2.3  |U|
+| 2.2.4  |U|
+| 2.2.5  |U|
+| 2.2.6  |U|
+| 2.2.7  |U|
+| 2.2.8  |U|
+| 2.2.9  |U|
+| 2.2.10 |U|
+| 2.2.11 |U|
+| 3.1.1  |U|
+| 3.1.2  |U|
+| 3.2.1  |U|
+| 3.2.2  |U|
+| 3.2.3  |U|
+| 3.3.1  |U|
+| 3.3.2  |U|
+| 3.3.3  |U|
+| 3.4.1  |U|
+| 3.4.2  |U|
+| 3.3.1  |U|
+| 3.3.2  |U|
+| 3.3.3  |U|
+| 3.3.4  |U|
+| 3.3.5  |U|
+| 4.0.1  |U|
+| 4.0.2  |U|
+| 5.0.1  |U|
+| 5.0.2  |U|
+| 5.0.3  |U|
+| 5.0.4  |U|
+| 5.1.1  |U|
+| 5.1.2  |U|
+| 5.1.3  |U|
+
+[TCS document]: https://tox.gitbooks.io/tox-client-standard/content/