Add knowledge base entry about channel namespaces

Added namespaces.md into kb/general.

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+Title: Channel namespaces
+---
+Our [policies](pages/policies) outline that channels on freenode fall into one of two categories.
+Channels that begin with only a single # character are primary channels. Channels that begin with
+two # characters are topical or ‘about’ channels.
+
+Primary channels
+================
+
+Primary channels are reserved for _official_ channels of on-topic projects.
+
+A registered group (as outlined on the page about [group registration](pages/groupreg)) can claim
+ownership over primary channels bearing the group's names or name prefixes. For example, freenode
+itself owns the channel ‘#freenode’ and all channels beginning with ‘#freenode-’.
+
+Primary channels do not expire. If you represent an on-topic project and would like to take over a
+primary channel for that project, do not hesitate to [contact us](pages/groupreg).
+
+Topical channels
+================
+
+Topical or ‘about’ channels are intended for _unofficial_ channels that are _about_ something that's
+on-topic. For example, an unofficial channel to talk about freenode is ##freenode. Topical channels
+do not mean ‘anything goes’. In particular, they are not for [off-topic use](pages/policies).
+
+Topical channels are given out on a first-come, first-served basis.  They will expire if unused for
+a long time, see our [policies](pages/policies) for details regarding when this occurs. You can
+contact us on IRC with a request to take over an expired topical channel.