Is there any light client for Monero where I can create and import private keys/mnemonic-seed and send and receive transactions like electrum for Bitcoin / Dash ?
This addresses part of your question:
The lightwallet by jwinterm is probably most similar thing to an SPV wallet so far https://getmonero.org/getting-started/choose
shen-noether is working on a mobile wallet that will connect to a remote node https://hellomonero.com/tags/shen-noether
Jaxx and Exodus wallets are also in development
Mnemonic seeds are avaible for Monero in several different forms
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this lightwallet doesn't work for me :/ i am not able to import my mnemonic-seed . failure all the time any other way to import my mnemonic-seed ? on mymonero, i have to pay 10XMR to get my history, so i cant use the balance without it? – coinling Aug 12 '16 at 16:44
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Unfortunately it just shut down after almost synced and now if i want to open it and type in the password it shuts down immediately all the time... – coinling Aug 13 '16 at 20:18
I assume you mean "light" to mean that the wallet does not keep a copy of the blockchain. Well, if you have a node to point the wallet at, whether it be a trusted external node or whether it be your little Raspberry Pi for example, then you can configure monero-wallet-cli to act as a light client. Actually, very little configuration is needed at all. See this post for how to do it on your internal network.
If you use monero-wallet-cli, it uses mnemonic seeds, and it has full wallet functionality (aside from it not currently having a GUI wrapped around it).