docs/phonemes.md: support the IPA chart suprasegmentals and tone marks.

docs/phonemes.md

     - [Co-articulation](#co-articulation-1)
       - [Precomposed Characters](#precomposed-characters)
   - [Suprasegmentals](#suprasegmentals)
+    - [Stress](#stress)
+    - [Length](#length)
+    - [Rhythm](#rhythm)
+    - [Intonation](#intonation)
+  - [Tones](#tones)
+    - [Tone Stepping](#tone-stepping)
   - [Unused](#unused)
 - [References](#references)
 
 
 ### Suprasegmentals
 
-| Feature | Kirshenbaum | Name            |
-|---------|-------------|-----------------|
-| `lng`   | `lng`       | long            |
+#### Stress
+
+| Feature | Kirshenbaum | IPA | Name             |
+|---------|-------------|-----|------------------|
+| `st1`   |             | ˈ◌  | primary stress   |
+| `st2`   |             | ˌ◌  | secondary stress |
+
+#### Length
+
+| Feature | Kirshenbaum | IPA | Name            |
+|---------|-------------|-----|-----------------|
+| `est`   |             | ◌̆   | extra short     |
+| `hlg`   |             | ◌ˑ  | half-long       |
+| `lng`   | `lng`       | ◌ː  | long            |
+
+#### Rhythm
+
+| Feature | Kirshenbaum | IPA | Name              |
+|---------|-------------|-----|-------------------|
+| `sbr`   |             | ◌.◌ | syllable break    |
+| `lnk`   |             | ◌‿◌ | linked (no break) |
+
+#### Intonation
+
+| Feature | Kirshenbaum | IPA    | Name                     |
+|---------|-------------|--------|--------------------------|
+| `fbr`   |             | | | minor (foot) break       |
+| `ibr`   |             | ‖      | major (intonation) break |
+| `glr`   |             | ↗      | global rise              |
+| `glf`   |             | ↘      | global fall              |
+
+### Tones
+
+| Tone               | IPA | Start | Middle | End   |
+|--------------------|-----|-------|--------|-------|
+| extra high (top)   | ◌˥  | `ts5` | `tm5`  | `te5` |
+| high               | ◌˦  | `ts4` | `tm4`  | `te4` |
+| mid                | ◌˧  | `ts3` | `tm3`  | `te3` |
+| low                | ◌˨  | `ts2` | `tm2`  | `te2` |
+| extra low (bottom) | ◌˩  | `ts1` | `tm1`  | `te1` |
+
+#### Tone Stepping
+
+| Feature | Kirshenbaum | IPA | Name        |
+|---------|-------------|-----|-------------|
+| `dst`   |             | ꜛ◌  | downstep    |
+| `ust`   |             | ꜜ◌  | upstep      |
 
 ### Unused