Docs update, getting started (#219)

* Docs update, getting started

* Typos

* Cleanups, linking

* Update with additional packages

docs/start/keyring.other.md

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+# Other addresses
+
+As mentioned in previous sections, the keyring not only has the ability to manage accounts (i.e. keypairs), but also allows you to add addresses/contacts as well as contracts to the keyring. This is very useful in the case where you are developing a wallet and want to save external addresses to interact with.
+
+Here we will give an overview of working with addresses, the same concepts can be expanded to work with contracts.
+
+## Adding an address
+
+For accounts, we have the `addUri(...)` endpoint that allows us to create and save an account. For addresses, we the keyring exposes `saveAddress (address: string, meta: KeyringPair$Meta)`, which we can use to save any address -
+
+```js
+...
+// add the address
+const FAUCET_ADDR = 'FvnazYM5KAetYpXoVDfqt9WFcJogKbekXVJ3Fz5oW2Dv82P';
+const json = keyring.saveAddress(FAUCET_ADDR, { name: 'Alex faucet' });
+
+// the faucet will now be in the list of available addresses
+keyring.getAddresses().forEach(...)
+```
+
+From this point forward, the address is in your keyring and can be retrieved via the `getAddresses()` interface. The same call can be used to update the meta for the address, for instance if we wish to change the name above, we can do -
+
+```js
+...
+const json = keyring.saveAddress(FAUCET_ADDR, { name: 'Alexander Faucet' });
+```
+
+And the already-saved address will be updated with the new metadata.
+
+## Removing an address
+
+To clear and address and remove it from the keyring, we can use the `forgetAddress(address: string)` call, this mirrors the `forgetAccount(address: string)` and `forgetContract(address: string)` calls. For instance -
+
+```js
+...
+// remove the specific address
+keyring.forgetAddress(FAUCET_ADDR);
+
+/// the faucet will not be in the list of addresses anymore
+keyring.getAddresses().forEach(...)
+```