Reword the readme slightly in Gidubba and convert the readme, license, and source code t a Gidubba-friendly format

gidubba.asm

@@ -1474,3 +1474,4 @@ bfsize: data    fe
 svstrt: addr    buffer + 100
 
 buffer:
+

license.md

@@ -21,3 +21,4 @@ IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
 CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+

readme.md

@@ -32,12 +32,13 @@ Commands with two arguments:
   * L: List a line
 
 Commands with no argument:
-  * P: Print (requires a printer)
-  * W: Writes to tape (requires a tape punch)
-  * R: Reads from tape (requires a tape reader)
+  * P: Print
+  * R: Read from the tape reader
+  * W: Write to the tape punch
   * H: Halt
 
 Both commands and arguments are case-insensitive. In both the command
 prompt as well as when inserting lines sending an escape (^[) will allow
 retyping the line in question. To finish inserting lines send a
 substitute (^Z): the line on which this is done is not saved.
+