README,CONTRIBUTING: More links.

Explain how to report bugs and how get accounts on the bugtracker;
add link to the troubleshooting document.

Part of #277

CONTRIBUTING.md

@@ -74,11 +74,16 @@ link to your forked arti repository at:
     $ git remote add _name_ git@gitlab.torproject.org:_name_/arti.git
     $ git fetch _name_
 
-> Tip, replace `_name_` in above, and following, commands to reflect your sign
+> *Tip*: replace `_name_` in above, and following, commands to reflect your sign
 > in name.
 >
-> Note, to fork this repository, or contribute to Issues and Merge Requests
-> requires an account. Check the
+> *Note*: to fork this repository, or contribute to Issues and Merge Requests,
+> you will need an account on our gitlab server.  If you don't have an
+> account there, you can either
+> [request an account](https://gitlab.onionize.space/) or
+> [report a bug anonymously](https://anonticket.onionize.space/).
+>
+> Check the
 > [Sign In](https://gitlab.torproject.org/users/sign_in?redirect_to_referer=yes)
 > page for further instructions on requesting access.
 

README.md

@@ -75,6 +75,9 @@ SOCKS proxy on port 9150.
 Again, do not use this program yet if you seriously need anonymity, privacy,
 security, or stability.
 
+If you run into any trouble building the program, please have a
+look at [the troubleshooting guide](doc/TROUBLESHOOTING.md).
+
 ## Minimum supported Rust Version
 
 Our current Minimum Supported Rust Version (MSRV) is 1.53.
@@ -144,6 +147,14 @@ get our project manager to sign off on them.
 
  * Arti ?.?.?: Relay support
 
+## <a name="reporting-bugs"></a> How can I report bugs?
+
+When you find bugs, please report them
+[on our bugtracker](https://gitlab.torproject.org/tpo/core/arti/). If you
+don't already have an account there, you can either
+[request an account](https://gitlab.onionize.space/) or
+[report a bug anonymously](https://anonticket.onionize.space/).
+
 ## How can I help out?
 
 See [`CONTRIBUTING.md`](./CONTRIBUTING.md) for a few ideas for how to get