Update tests/README.md, add coverage file

Author: TimRudy

tests/CodeCoverageIndex.md

@@ -0,0 +1,41 @@
+**Uart8Receiver**
+
+| Code location                                                | Test #        |
+| :------------------------------------------------------------| :-------------|
+| 79   if (out_hold_count == 5'b10000) begin              | 12, 25, 27    |
+| 110 if (en && err && !in_sample) begin                       | 30            |
+| 133 if (sample_count == 4'b0) begin                          | 1, 16         |
+| 134 if (&in_prior_hold_reg \|\| done && !err) begin          | 1, 16, 24, 28 |
+| 141 end else begin                                           | 17, 18, 24    |
+| 148 if (sample_count == 4'b1100) begin                       | 1, 16         |
+| 158 end else if (\|sample_count) begin                       | 18, 19        |
+| 215 if (sample_count[3]) begin                               | 20, 21, 22    |
+| 216 if (!in_sample) begin                                    | 21*, 22*      |
+| 220 if (sample_count == 4'b1000 && &in_prior_hold_reg) begin | 25            |
+| 228 end else if (&sample_count) begin                        | 23            |
+| 238 if (&in_current_hold_reg) begin                          | 1, 20, 21     |
+| 244 end else if (&sample_count) begin                        | 5**, 22       |
+| 261 if (!err && !in_sample \|\| &sample_count) begin         | 27            |
+| 269 if (in_sample) begin                                     | 1, 9, 28      |
+| 274 end else begin [case: !in_sample]                        |            |
+| 282 end else begin [case: !&sample_count]                    | 12            |
+| 290 end else if (&sample_count[3:1]) begin                   | 30            |
+
+<br />
+
+**Uart8Transmitter**
+
+| Code location                            | Test #        |
+| :----------------------------------------| :-------------|
+| 84 &nbsp; if (start) begin               | 1, 6, 7, 8, 9 |
+| 115 if (start) begin                     | 9, 12         |
+| 116 if (done == 1'b0) begin              | 9, 12         |
+| 118 if (TURBO_FRAMES) begin              | 12            |
+| 120 end else begin [case: !TURBO_FRAMES] &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; | 9, 13         |
+| 123 end else begin [case: done == 1'b1]  | 9, 13         |
+| 127 end else begin [case: !start]        | 1, 4          |
+
+<br />
+
+\* With no meeting the inner conditions lines 220 and 228  
+\*\* See second transaction